* [PATCH 0/7] get rid of the SEDF scheduler
@ 2015-06-26 16:18 Dario Faggioli
2015-06-26 16:18 ` [PATCH 1/7] libxl: " Dario Faggioli
` (7 more replies)
0 siblings, 8 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:18 UTC (permalink / raw)
To: xen-devel
Cc: George Dunlap, Wei Liu, Ian Jackson, Ian Campbell, Stefano Stabellini
Hi everyone,
This series is the follow up of this proposal and conversation:
http://lists.xen.org/archives/html/xen-devel/2015-05/msg02874.html
Let me quote this (again), from 2006:
git show db51cd09d37ea44b126bb259f9392248afd768e6
...
diff --git a/docs/src/interface.tex b/docs/src/interface.tex
index c9017c7..9a59840 100644
--- a/docs/src/interface.tex
+++ b/docs/src/interface.tex
@@ -209,8 +209,8 @@ implement timeout values when they block.
Xen offers a uniform API for CPU schedulers. It is possible to choose
from a number of schedulers at boot and it should be easy to add more.
-The SEDF, BVT, and Credit schedulers are part of the normal Xen
-distribution. BVT and SEDF will be going away and their use should be
+The SEDF and Credit schedulers are part of the normal Xen
+distribution. SEDF will be going away and its use should be
avoided once the credit scheduler has stabilized and become the default.
The Credit scheduler provides proportional fair shares of the
host's CPUs to the running domains. It does this while transparently
So, after being "going away" for 9 years, here we are, getting rid of it!
Hopefully, I've killed every sign of it, and did not overlook anything.
I'm not sure whether the python bindings are an interface that we consider
stable. I've killed everything about SEDF from there, but I don't know sure how
to test this. If I should do it differently, let me know.
In libxl, I left the symbols and the data types in place, for the sake of
build-time backward compatibility, but any attempt of calling one of the
scheduler API function with LIBXL_SCHEDULED_SEDF as the scheduler id, results
in an error.
As far as testing goes, I have verified that:
- the repo builds, both xen and tools, at each stage of the series
- booting with sched=sedf no longer works
- with all the series applied, `xl sched-sedf' no longer exists
- with the libxl+libxc patches patch applied (so, with SEDF still available in Xen
and xl), `xl sched-sedf' exists, but produces an error
There is an OSSTest patch that shuts down SEDF testing for xen-unstable
(actually, for everything greater than xen-4.5) here:
http://lists.xen.org/archives/html/xen-devel/2015-06/msg04399.html
Regards,
Dario
---
Dario Faggioli (7):
libxl: get rid of the SEDF scheduler
tools: python: get rid of the SEDF scheduler bindings
libxc: get rid of the SEDF scheduler
xen: get rid of the SEDF scheduler
xen: kill sched_sedf.c
xl: get rid of the SEDF scheduler
docs: get rid of the SEDF scheduler
docs/INDEX | 1
docs/man/xl.cfg.pod.5 | 24
docs/man/xl.pod.1 | 42 -
docs/man/xlcpupool.cfg.pod.5 | 4
docs/misc/sedf_scheduler_mini-HOWTO.txt | 44 -
docs/misc/xen-command-line.markdown | 2
tools/examples/cpupool | 2
tools/libxc/Makefile | 1
tools/libxc/include/xenctrl.h | 12
tools/libxc/xc_sedf.c | 78 --
tools/libxl/libxl.c | 73 -
tools/libxl/libxl_create.c | 61 -
tools/libxl/xl.h | 1
tools/libxl/xl_cmdimpl.c | 139 ---
tools/libxl/xl_cmdtable.c | 16
tools/python/xen/lowlevel/xc/xc.c | 70 -
xen/common/Makefile | 1
xen/common/sched_sedf.c | 1556 -------------------------------
xen/common/schedule.c | 1
xen/include/public/domctl.h | 8
xen/include/public/trace.h | 1
xen/include/xen/sched-if.h | 1
22 files changed, 7 insertions(+), 2131 deletions(-)
delete mode 100644 docs/misc/sedf_scheduler_mini-HOWTO.txt
delete mode 100644 tools/libxc/xc_sedf.c
delete mode 100644 xen/common/sched_sedf.c
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 1/7] libxl: get rid of the SEDF scheduler
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
@ 2015-06-26 16:18 ` Dario Faggioli
2015-06-26 16:18 ` [PATCH 2/7] tools: python: get rid of the SEDF scheduler bindings Dario Faggioli
` (6 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:18 UTC (permalink / raw)
To: xen-devel
Cc: George Dunlap, Wei Liu, Ian Jackson, Ian Campbell, Stefano Stabellini
only the interface is left in place, for backward
compile-time compatibility, but every attempt to
use it would throw an error.
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
---
tools/libxl/libxl.c | 73 ++------------------------------------------
tools/libxl/libxl_create.c | 61 -------------------------------------
2 files changed, 4 insertions(+), 130 deletions(-)
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index cfc2623..d2697e0 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -5760,73 +5760,6 @@ static int sched_credit2_domain_set(libxl__gc *gc, uint32_t domid,
return 0;
}
-static int sched_sedf_domain_get(libxl__gc *gc, uint32_t domid,
- libxl_domain_sched_params *scinfo)
-{
- uint64_t period;
- uint64_t slice;
- uint64_t latency;
- uint16_t extratime;
- uint16_t weight;
- int rc;
-
- rc = xc_sedf_domain_get(CTX->xch, domid, &period, &slice, &latency,
- &extratime, &weight);
- if (rc != 0) {
- LOGE(ERROR, "getting domain sched sedf");
- return ERROR_FAIL;
- }
-
- libxl_domain_sched_params_init(scinfo);
- scinfo->sched = LIBXL_SCHEDULER_SEDF;
- scinfo->period = period / 1000000;
- scinfo->slice = slice / 1000000;
- scinfo->latency = latency / 1000000;
- scinfo->extratime = extratime;
- scinfo->weight = weight;
-
- return 0;
-}
-
-static int sched_sedf_domain_set(libxl__gc *gc, uint32_t domid,
- const libxl_domain_sched_params *scinfo)
-{
- uint64_t period;
- uint64_t slice;
- uint64_t latency;
- uint16_t extratime;
- uint16_t weight;
-
- int ret;
-
- ret = xc_sedf_domain_get(CTX->xch, domid, &period, &slice, &latency,
- &extratime, &weight);
- if (ret != 0) {
- LOGE(ERROR, "getting domain sched sedf");
- return ERROR_FAIL;
- }
-
- if (scinfo->period != LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT)
- period = (uint64_t)scinfo->period * 1000000;
- if (scinfo->slice != LIBXL_DOMAIN_SCHED_PARAM_SLICE_DEFAULT)
- slice = (uint64_t)scinfo->slice * 1000000;
- if (scinfo->latency != LIBXL_DOMAIN_SCHED_PARAM_LATENCY_DEFAULT)
- latency = (uint64_t)scinfo->latency * 1000000;
- if (scinfo->extratime != LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT)
- extratime = scinfo->extratime;
- if (scinfo->weight != LIBXL_DOMAIN_SCHED_PARAM_WEIGHT_DEFAULT)
- weight = scinfo->weight;
-
- ret = xc_sedf_domain_set(CTX->xch, domid, period, slice, latency,
- extratime, weight);
- if ( ret < 0 ) {
- LOGE(ERROR, "setting domain sched sedf");
- return ERROR_FAIL;
- }
-
- return 0;
-}
-
static int sched_rtds_domain_get(libxl__gc *gc, uint32_t domid,
libxl_domain_sched_params *scinfo)
{
@@ -5905,7 +5838,8 @@ int libxl_domain_sched_params_set(libxl_ctx *ctx, uint32_t domid,
switch (sched) {
case LIBXL_SCHEDULER_SEDF:
- ret=sched_sedf_domain_set(gc, domid, scinfo);
+ LOG(ERROR, "SEDF scheduler no longer available");
+ ret=ERROR_INVAL;
break;
case LIBXL_SCHEDULER_CREDIT:
ret=sched_credit_domain_set(gc, domid, scinfo);
@@ -5941,7 +5875,8 @@ int libxl_domain_sched_params_get(libxl_ctx *ctx, uint32_t domid,
switch (scinfo->sched) {
case LIBXL_SCHEDULER_SEDF:
- ret=sched_sedf_domain_get(gc, domid, scinfo);
+ LOG(ERROR, "SEDF scheduler no longer available");
+ ret=ERROR_INVAL;
break;
case LIBXL_SCHEDULER_CREDIT:
ret=sched_credit_domain_get(gc, domid, scinfo);
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 86384d2..89408b8 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -50,61 +50,6 @@ int libxl__domain_create_info_setdefault(libxl__gc *gc,
return 0;
}
-static int sched_params_valid(libxl__gc *gc,
- uint32_t domid, libxl_domain_sched_params *scp)
-{
- int has_weight = scp->weight != LIBXL_DOMAIN_SCHED_PARAM_WEIGHT_DEFAULT;
- int has_period = scp->period != LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT;
- int has_slice = scp->slice != LIBXL_DOMAIN_SCHED_PARAM_SLICE_DEFAULT;
- int has_extratime =
- scp->extratime != LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT;
-
- /* The sedf scheduler needs some more consistency checking */
- if (libxl__domain_scheduler(gc, domid) == LIBXL_SCHEDULER_SEDF) {
- if (has_weight && (has_period || has_slice))
- return 0;
- /* If you want a real-time domain, with its own period and
- * slice, please, do provide both! */
- if (has_period != has_slice)
- return 0;
-
- /*
- * Idea is, if we specify a weight, then both period and
- * slice has to be zero. OTOH, if we do specify a period and
- * slice, it is weight that should be zeroed. See
- * docs/misc/sedf_scheduler_mini-HOWTO.txt for more details
- * on the meaningful combinations and their meanings.
- */
- if (has_weight) {
- scp->slice = 0;
- scp->period = 0;
- }
- else if (!has_period) {
- /* No weight nor slice/period means best effort. Parameters needs
- * some mangling in order to properly ask for that, though. */
-
- /*
- * Providing no weight does not make any sense if we do not allow
- * the domain to run in extra time. On the other hand, if we have
- * extra time, weight will be ignored (and zeroed) by Xen, but it
- * can't be zero here, or the call for setting the scheduling
- * parameters will fail. So, avoid the latter by setting a random
- * weight (namely, 1), as it will be ignored anyway.
- */
-
- /* We can setup a proper best effort domain (extra time only)
- * iff we either already have or are asking for some extra time. */
- scp->weight = has_extratime ? scp->extratime : 1;
- scp->period = 0;
- } else {
- /* Real-time domain: will get slice CPU time over every period */
- scp->weight = 0;
- }
- }
-
- return 1;
-}
-
int libxl__domain_build_info_setdefault(libxl__gc *gc,
libxl_domain_build_info *b_info)
{
@@ -915,12 +860,6 @@ static void initiate_domain_create(libxl__egc *egc,
ret = libxl__domain_build_info_setdefault(gc, &d_config->b_info);
if (ret) goto error_out;
- if (!sched_params_valid(gc, domid, &d_config->b_info.sched_params)) {
- LOG(ERROR, "Invalid scheduling parameters\n");
- ret = ERROR_INVAL;
- goto error_out;
- }
-
for (i = 0; i < d_config->num_disks; i++) {
ret = libxl__device_disk_setdefault(gc, &d_config->disks[i]);
if (ret) goto error_out;
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 2/7] tools: python: get rid of the SEDF scheduler bindings
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
2015-06-26 16:18 ` [PATCH 1/7] libxl: " Dario Faggioli
@ 2015-06-26 16:18 ` Dario Faggioli
2015-06-26 16:19 ` [PATCH 3/7] libxc: get rid of the SEDF scheduler Dario Faggioli
` (5 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:18 UTC (permalink / raw)
To: xen-devel
Cc: George Dunlap, Wei Liu, Ian Jackson, Ian Campbell, Stefano Stabellini
as it is going away from libxc, so these won't build any
longer.
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
---
tools/python/xen/lowlevel/xc/xc.c | 70 -------------------------------------
1 file changed, 70 deletions(-)
diff --git a/tools/python/xen/lowlevel/xc/xc.c b/tools/python/xen/lowlevel/xc/xc.c
index c77e15b..ee3e1d0 100644
--- a/tools/python/xen/lowlevel/xc/xc.c
+++ b/tools/python/xen/lowlevel/xc/xc.c
@@ -1433,51 +1433,6 @@ static PyObject *pyxc_xeninfo(XcObject *self)
"cc_compile_date", xen_cc.compile_date);
}
-
-static PyObject *pyxc_sedf_domain_set(XcObject *self,
- PyObject *args,
- PyObject *kwds)
-{
- uint32_t domid;
- uint64_t period, slice, latency;
- uint16_t extratime, weight;
- static char *kwd_list[] = { "domid", "period", "slice",
- "latency", "extratime", "weight",NULL };
-
- if( !PyArg_ParseTupleAndKeywords(args, kwds, "iLLLhh", kwd_list,
- &domid, &period, &slice,
- &latency, &extratime, &weight) )
- return NULL;
- if ( xc_sedf_domain_set(self->xc_handle, domid, period,
- slice, latency, extratime,weight) != 0 )
- return pyxc_error_to_exception(self->xc_handle);
-
- Py_INCREF(zero);
- return zero;
-}
-
-static PyObject *pyxc_sedf_domain_get(XcObject *self, PyObject *args)
-{
- uint32_t domid;
- uint64_t period, slice,latency;
- uint16_t weight, extratime;
-
- if(!PyArg_ParseTuple(args, "i", &domid))
- return NULL;
-
- if (xc_sedf_domain_get(self->xc_handle, domid, &period,
- &slice,&latency,&extratime,&weight))
- return pyxc_error_to_exception(self->xc_handle);
-
- return Py_BuildValue("{s:i,s:L,s:L,s:L,s:i,s:i}",
- "domid", domid,
- "period", period,
- "slice", slice,
- "latency", latency,
- "extratime", extratime,
- "weight", weight);
-}
-
static PyObject *pyxc_shadow_control(PyObject *self,
PyObject *args,
PyObject *kwds)
@@ -2490,30 +2445,6 @@ static PyMethodDef pyxc_methods[] = {
"Get the current scheduler type in use.\n"
"Returns: [int] sched_id.\n" },
- { "sedf_domain_set",
- (PyCFunction)pyxc_sedf_domain_set,
- METH_KEYWORDS, "\n"
- "Set the scheduling parameters for a domain when running with Atropos.\n"
- " dom [int]: domain to set\n"
- " period [long]: domain's scheduling period\n"
- " slice [long]: domain's slice per period\n"
- " latency [long]: domain's wakeup latency hint\n"
- " extratime [int]: domain aware of extratime?\n"
- "Returns: [int] 0 on success; -1 on error.\n" },
-
- { "sedf_domain_get",
- (PyCFunction)pyxc_sedf_domain_get,
- METH_VARARGS, "\n"
- "Get the current scheduling parameters for a domain when running with\n"
- "the Atropos scheduler."
- " dom [int]: domain to query\n"
- "Returns: [dict]\n"
- " domain [int]: domain ID\n"
- " period [long]: scheduler period\n"
- " slice [long]: CPU reservation per period\n"
- " latency [long]: domain's wakeup latency hint\n"
- " extratime [int]: domain aware of extratime?\n"},
-
{ "sched_credit_domain_set",
(PyCFunction)pyxc_sched_credit_domain_set,
METH_KEYWORDS, "\n"
@@ -3033,7 +2964,6 @@ PyMODINIT_FUNC initxc(void)
PyModule_AddObject(m, "Error", xc_error_obj);
/* Expose some libxc constants to Python */
- PyModule_AddIntConstant(m, "XEN_SCHEDULER_SEDF", XEN_SCHEDULER_SEDF);
PyModule_AddIntConstant(m, "XEN_SCHEDULER_CREDIT", XEN_SCHEDULER_CREDIT);
PyModule_AddIntConstant(m, "XEN_SCHEDULER_CREDIT2", XEN_SCHEDULER_CREDIT2);
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 3/7] libxc: get rid of the SEDF scheduler
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
2015-06-26 16:18 ` [PATCH 1/7] libxl: " Dario Faggioli
2015-06-26 16:18 ` [PATCH 2/7] tools: python: get rid of the SEDF scheduler bindings Dario Faggioli
@ 2015-06-26 16:19 ` Dario Faggioli
2015-06-26 16:19 ` [PATCH 4/7] xen: " Dario Faggioli
` (4 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:19 UTC (permalink / raw)
To: xen-devel
Cc: George Dunlap, Wei Liu, Ian Jackson, Ian Campbell, Stefano Stabellini
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
---
tools/libxc/Makefile | 1 -
tools/libxc/include/xenctrl.h | 12 ------
tools/libxc/xc_sedf.c | 78 -----------------------------------------
3 files changed, 91 deletions(-)
delete mode 100644 tools/libxc/xc_sedf.c
diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 153b79e..b659df4 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -21,7 +21,6 @@ CTRL_SRCS-y += xc_misc.c
CTRL_SRCS-y += xc_flask.c
CTRL_SRCS-y += xc_physdev.c
CTRL_SRCS-y += xc_private.c
-CTRL_SRCS-y += xc_sedf.c
CTRL_SRCS-y += xc_csched.c
CTRL_SRCS-y += xc_csched2.c
CTRL_SRCS-y += xc_arinc653.c
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index d1d2ab3..31c7cb9 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -875,18 +875,6 @@ int xc_shadow_control(xc_interface *xch,
uint32_t mode,
xc_shadow_op_stats_t *stats);
-int xc_sedf_domain_set(xc_interface *xch,
- uint32_t domid,
- uint64_t period, uint64_t slice,
- uint64_t latency, uint16_t extratime,
- uint16_t weight);
-
-int xc_sedf_domain_get(xc_interface *xch,
- uint32_t domid,
- uint64_t* period, uint64_t *slice,
- uint64_t *latency, uint16_t *extratime,
- uint16_t *weight);
-
int xc_sched_credit_domain_set(xc_interface *xch,
uint32_t domid,
struct xen_domctl_sched_credit *sdom);
diff --git a/tools/libxc/xc_sedf.c b/tools/libxc/xc_sedf.c
deleted file mode 100644
index db372ca..0000000
--- a/tools/libxc/xc_sedf.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/******************************************************************************
- * xc_sedf.c
- *
- * API for manipulating parameters of the Simple EDF scheduler.
- *
- * changes by Stephan Diestelhorst
- * based on code
- * by Mark Williamson, Copyright (c) 2004 Intel Research Cambridge.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "xc_private.h"
-
-int xc_sedf_domain_set(
- xc_interface *xch,
- uint32_t domid,
- uint64_t period,
- uint64_t slice,
- uint64_t latency,
- uint16_t extratime,
- uint16_t weight)
-{
- DECLARE_DOMCTL;
- struct xen_domctl_sched_sedf *p = &domctl.u.scheduler_op.u.sedf;
-
- domctl.cmd = XEN_DOMCTL_scheduler_op;
- domctl.domain = (domid_t)domid;
- domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_SEDF;
- domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_putinfo;
-
- p->period = period;
- p->slice = slice;
- p->latency = latency;
- p->extratime = extratime;
- p->weight = weight;
- return do_domctl(xch, &domctl);
-}
-
-int xc_sedf_domain_get(
- xc_interface *xch,
- uint32_t domid,
- uint64_t *period,
- uint64_t *slice,
- uint64_t *latency,
- uint16_t *extratime,
- uint16_t *weight)
-{
- DECLARE_DOMCTL;
- int ret;
- struct xen_domctl_sched_sedf *p = &domctl.u.scheduler_op.u.sedf;
-
- domctl.cmd = XEN_DOMCTL_scheduler_op;
- domctl.domain = (domid_t)domid;
- domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_SEDF;
- domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_getinfo;
-
- ret = do_domctl(xch, &domctl);
-
- *period = p->period;
- *slice = p->slice;
- *latency = p->latency;
- *extratime = p->extratime;
- *weight = p->weight;
- return ret;
-}
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 4/7] xen: get rid of the SEDF scheduler
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
` (2 preceding siblings ...)
2015-06-26 16:19 ` [PATCH 3/7] libxc: get rid of the SEDF scheduler Dario Faggioli
@ 2015-06-26 16:19 ` Dario Faggioli
2015-06-29 11:56 ` Andrew Cooper
2015-06-26 16:19 ` [PATCH 5/7] xen: kill sched_sedf.c Dario Faggioli
` (3 subsequent siblings)
7 siblings, 1 reply; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:19 UTC (permalink / raw)
To: xen-devel; +Cc: George Dunlap
more specifically, of all the symbols and references
to it.
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
---
Cc: George Dunlap <george.dunlap@eu.citrix.com>
---
docs/misc/xen-command-line.markdown | 2 +-
xen/common/Makefile | 1 -
xen/common/schedule.c | 1 -
xen/include/public/domctl.h | 8 --------
xen/include/public/trace.h | 1 -
xen/include/xen/sched-if.h | 1 -
6 files changed, 1 insertion(+), 13 deletions(-)
diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index aa684c0..d292fae 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -1206,7 +1206,7 @@ Map the HPET page as read only in Dom0. If disabled the page will be mapped
with read and write permissions.
### sched
-> `= credit | credit2 | sedf | arinc653`
+> `= credit | credit2 | arinc653`
> Default: `sched=credit`
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 1cddebc..3fdf931 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -31,7 +31,6 @@ obj-y += rbtree.o
obj-y += rcupdate.o
obj-y += sched_credit.o
obj-y += sched_credit2.o
-obj-y += sched_sedf.o
obj-y += sched_arinc653.o
obj-y += sched_rt.o
obj-y += schedule.o
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index ecf1545..0dc2788 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -65,7 +65,6 @@ DEFINE_PER_CPU(struct schedule_data, schedule_data);
DEFINE_PER_CPU(struct scheduler *, scheduler);
static const struct scheduler *schedulers[] = {
- &sched_sedf_def,
&sched_credit_def,
&sched_credit2_def,
&sched_arinc653_def,
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index bc45ea5..a779053 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -324,7 +324,6 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_max_vcpus_t);
/* XEN_DOMCTL_scheduler_op */
/* Scheduler types. */
-#define XEN_SCHEDULER_SEDF 4
#define XEN_SCHEDULER_CREDIT 5
#define XEN_SCHEDULER_CREDIT2 6
#define XEN_SCHEDULER_ARINC653 7
@@ -337,13 +336,6 @@ struct xen_domctl_scheduler_op {
uint32_t sched_id; /* XEN_SCHEDULER_* */
uint32_t cmd; /* XEN_DOMCTL_SCHEDOP_* */
union {
- struct xen_domctl_sched_sedf {
- uint64_aligned_t period;
- uint64_aligned_t slice;
- uint64_aligned_t latency;
- uint32_t extratime;
- uint32_t weight;
- } sedf;
struct xen_domctl_sched_credit {
uint16_t weight;
uint16_t cap;
diff --git a/xen/include/public/trace.h b/xen/include/public/trace.h
index 5211ae7..36be196 100644
--- a/xen/include/public/trace.h
+++ b/xen/include/public/trace.h
@@ -75,7 +75,6 @@
/* Per-scheduler IDs, to identify scheduler specific events */
#define TRC_SCHED_CSCHED 0
#define TRC_SCHED_CSCHED2 1
-#define TRC_SCHED_SEDF 2
#define TRC_SCHED_ARINC653 3
#define TRC_SCHED_RTDS 4
diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
index 7cc25c6..dbe7cab 100644
--- a/xen/include/xen/sched-if.h
+++ b/xen/include/xen/sched-if.h
@@ -165,7 +165,6 @@ struct scheduler {
void (*tick_resume) (const struct scheduler *, unsigned int);
};
-extern const struct scheduler sched_sedf_def;
extern const struct scheduler sched_credit_def;
extern const struct scheduler sched_credit2_def;
extern const struct scheduler sched_arinc653_def;
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 5/7] xen: kill sched_sedf.c
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
` (3 preceding siblings ...)
2015-06-26 16:19 ` [PATCH 4/7] xen: " Dario Faggioli
@ 2015-06-26 16:19 ` Dario Faggioli
2015-06-26 16:19 ` [PATCH 6/7] xl: get rid of the SEDF scheduler Dario Faggioli
` (2 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:19 UTC (permalink / raw)
To: xen-devel; +Cc: George Dunlap
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
---
Cc: George Dunlap <george.dunlap@eu.citrix.com>
---
xen/common/sched_sedf.c | 1556 -----------------------------------------------
1 file changed, 1556 deletions(-)
delete mode 100644 xen/common/sched_sedf.c
diff --git a/xen/common/sched_sedf.c b/xen/common/sched_sedf.c
deleted file mode 100644
index a1a4cb7..0000000
--- a/xen/common/sched_sedf.c
+++ /dev/null
@@ -1,1556 +0,0 @@
-/******************************************************************************
- * Simple EDF scheduler for xen
- *
- * by Stephan Diestelhorst (C) 2004 Cambridge University
- * based on code by Mark Williamson (C) 2004 Intel Research Cambridge
- */
-
-#include <xen/lib.h>
-#include <xen/sched.h>
-#include <xen/sched-if.h>
-#include <xen/timer.h>
-#include <xen/softirq.h>
-#include <xen/time.h>
-#include <xen/errno.h>
-
-#ifndef NDEBUG
-#define SEDF_STATS
-#define CHECK(_p) \
- do { \
- if ( !(_p) ) \
- printk("Check '%s' failed, line %d, file %s\n", \
- #_p , __LINE__, __FILE__); \
- } while ( 0 )
-#else
-#define CHECK(_p) ((void)0)
-#endif
-
-#define EXTRA_NONE (0)
-#define EXTRA_AWARE (1)
-#define EXTRA_RUN_PEN (2)
-#define EXTRA_RUN_UTIL (4)
-#define EXTRA_WANT_PEN_Q (8)
-#define EXTRA_PEN_Q (0)
-#define EXTRA_UTIL_Q (1)
-#define SEDF_ASLEEP (16)
-
-#define EXTRA_QUANTUM (MICROSECS(500))
-#define WEIGHT_PERIOD (MILLISECS(100))
-#define WEIGHT_SAFETY (MILLISECS(5))
-
-#define PERIOD_MAX MILLISECS(10000) /* 10s */
-#define PERIOD_MIN (MICROSECS(10)) /* 10us */
-#define SLICE_MIN (MICROSECS(5)) /* 5us */
-
-#define IMPLY(a, b) (!(a) || (b))
-#define EQ(a, b) ((!!(a)) == (!!(b)))
-
-
-struct sedf_dom_info {
- struct domain *domain;
-};
-
-struct sedf_priv_info {
- /* lock for the whole pluggable scheduler, nests inside cpupool_lock */
- spinlock_t lock;
-};
-
-struct sedf_vcpu_info {
- struct vcpu *vcpu;
- struct list_head list;
- struct list_head extralist[2];
-
- /* Parameters for EDF */
- s_time_t period; /* = relative deadline */
- s_time_t slice; /* = worst case execution time */
-
- /* Advaced Parameters */
-
- /* Latency Scaling */
- s_time_t period_orig;
- s_time_t slice_orig;
- s_time_t latency;
-
- /* Status of domain */
- int status;
- /* Weights for "Scheduling for beginners/ lazy/ etc." ;) */
- short weight;
- short extraweight;
- /* Bookkeeping */
- s_time_t deadl_abs;
- s_time_t sched_start_abs;
- s_time_t cputime;
- /* Times the domain un-/blocked */
- s_time_t block_abs;
- s_time_t unblock_abs;
-
- /* Scores for {util, block penalty}-weighted extratime distribution */
- int score[2];
- s_time_t short_block_lost_tot;
-
- /* Statistics */
- s_time_t extra_time_tot;
-
-#ifdef SEDF_STATS
- s_time_t block_time_tot;
- s_time_t penalty_time_tot;
- int block_tot;
- int short_block_tot;
- int long_block_tot;
- int pen_extra_blocks;
- int pen_extra_slices;
-#endif
-};
-
-struct sedf_cpu_info {
- struct list_head runnableq;
- struct list_head waitq;
- struct list_head extraq[2];
- s_time_t current_slice_expires;
-};
-
-#define SEDF_PRIV(_ops) \
- ((struct sedf_priv_info *)((_ops)->sched_data))
-#define EDOM_INFO(d) ((struct sedf_vcpu_info *)((d)->sched_priv))
-#define CPU_INFO(cpu) \
- ((struct sedf_cpu_info *)per_cpu(schedule_data, cpu).sched_priv)
-#define LIST(d) (&EDOM_INFO(d)->list)
-#define EXTRALIST(d,i) (&(EDOM_INFO(d)->extralist[i]))
-#define RUNQ(cpu) (&CPU_INFO(cpu)->runnableq)
-#define WAITQ(cpu) (&CPU_INFO(cpu)->waitq)
-#define EXTRAQ(cpu,i) (&(CPU_INFO(cpu)->extraq[i]))
-#define IDLETASK(cpu) (idle_vcpu[cpu])
-
-#define PERIOD_BEGIN(inf) ((inf)->deadl_abs - (inf)->period)
-
-#define DIV_UP(x,y) (((x) + (y) - 1) / y)
-
-#define extra_runs(inf) ((inf->status) & 6)
-#define extra_get_cur_q(inf) (((inf->status & 6) >> 1)-1)
-#define sedf_runnable(edom) (!(EDOM_INFO(edom)->status & SEDF_ASLEEP))
-
-
-static void sedf_dump_cpu_state(const struct scheduler *ops, int i);
-
-static inline int extraq_on(struct vcpu *d, int i)
-{
- return ((EXTRALIST(d,i)->next != NULL) &&
- (EXTRALIST(d,i)->next != EXTRALIST(d,i)));
-}
-
-static inline void extraq_del(struct vcpu *d, int i)
-{
- struct list_head *list = EXTRALIST(d,i);
- ASSERT(extraq_on(d,i));
- list_del(list);
- list->next = NULL;
- ASSERT(!extraq_on(d, i));
-}
-
-/*
- * Adds a domain to the queue of processes which are aware of extra time. List
- * is sorted by score, where a lower score means higher priority for an extra
- * slice. It also updates the score, by simply subtracting a fixed value from
- * each entry, in order to avoid overflow. The algorithm works by simply
- * charging each domain that recieved extratime with an inverse of its weight.
- */
-static inline void extraq_add_sort_update(struct vcpu *d, int i, int sub)
-{
- struct list_head *cur;
- struct sedf_vcpu_info *curinf;
-
- ASSERT(!extraq_on(d,i));
-
- /*
- * Iterate through all elements to find our "hole" and on our way
- * update all the other scores.
- */
- list_for_each ( cur, EXTRAQ(d->processor, i) )
- {
- curinf = list_entry(cur,struct sedf_vcpu_info,extralist[i]);
- curinf->score[i] -= sub;
- if ( EDOM_INFO(d)->score[i] < curinf->score[i] )
- break;
- }
-
- /* cur now contains the element, before which we'll enqueue */
- list_add(EXTRALIST(d,i),cur->prev);
-
- /* Continue updating the extraq */
- if ( (cur != EXTRAQ(d->processor,i)) && sub )
- {
- for ( cur = cur->next; cur != EXTRAQ(d->processor,i); cur = cur->next )
- {
- curinf = list_entry(cur,struct sedf_vcpu_info, extralist[i]);
- curinf->score[i] -= sub;
- }
- }
-
- ASSERT(extraq_on(d,i));
-}
-static inline void extraq_check(struct vcpu *d)
-{
- if ( extraq_on(d, EXTRA_UTIL_Q) )
- {
- if ( !(EDOM_INFO(d)->status & EXTRA_AWARE) &&
- !extra_runs(EDOM_INFO(d)) )
- extraq_del(d, EXTRA_UTIL_Q);
- }
- else
- {
- if ( (EDOM_INFO(d)->status & EXTRA_AWARE) && sedf_runnable(d) )
- extraq_add_sort_update(d, EXTRA_UTIL_Q, 0);
- }
-}
-
-static inline void extraq_check_add_unblocked(struct vcpu *d, int priority)
-{
- struct sedf_vcpu_info *inf = EDOM_INFO(d);
-
- if ( inf->status & EXTRA_AWARE )
- /* Put on the weighted extraq without updating any scores */
- extraq_add_sort_update(d, EXTRA_UTIL_Q, 0);
-}
-
-static inline int __task_on_queue(struct vcpu *d)
-{
- return (((LIST(d))->next != NULL) && (LIST(d)->next != LIST(d)));
-}
-
-static inline void __del_from_queue(struct vcpu *d)
-{
- struct list_head *list = LIST(d);
- ASSERT(__task_on_queue(d));
- list_del(list);
- list->next = NULL;
- ASSERT(!__task_on_queue(d));
-}
-
-typedef int(*list_comparer)(struct list_head* el1, struct list_head* el2);
-
-static inline void list_insert_sort(
- struct list_head *list, struct list_head *element, list_comparer comp)
-{
- struct list_head *cur;
-
- /* Iterate through all elements to find our "hole" */
- list_for_each( cur, list )
- if ( comp(element, cur) < 0 )
- break;
-
- /* cur now contains the element, before which we'll enqueue */
- list_add(element, cur->prev);
-}
-
-#define DOMAIN_COMPARER(name, field, comp1, comp2) \
-static int name##_comp(struct list_head* el1, struct list_head* el2) \
-{ \
- struct sedf_vcpu_info *d1, *d2; \
- d1 = list_entry(el1,struct sedf_vcpu_info, field); \
- d2 = list_entry(el2,struct sedf_vcpu_info, field); \
- if ( (comp1) == (comp2) ) \
- return 0; \
- if ( (comp1) < (comp2) ) \
- return -1; \
- else \
- return 1; \
-}
-
-/*
- * Adds a domain to the queue of processes which wait for the beginning of the
- * next period; this list is therefore sortet by this time, which is simply
- * absol. deadline - period.
- */
-DOMAIN_COMPARER(waitq, list, PERIOD_BEGIN(d1), PERIOD_BEGIN(d2));
-static inline void __add_to_waitqueue_sort(struct vcpu *v)
-{
- ASSERT(!__task_on_queue(v));
- list_insert_sort(WAITQ(v->processor), LIST(v), waitq_comp);
- ASSERT(__task_on_queue(v));
-}
-
-/*
- * Adds a domain to the queue of processes which have started their current
- * period and are runnable (i.e. not blocked, dieing,...). The first element
- * on this list is running on the processor, if the list is empty the idle
- * task will run. As we are implementing EDF, this list is sorted by deadlines.
- */
-DOMAIN_COMPARER(runq, list, d1->deadl_abs, d2->deadl_abs);
-static inline void __add_to_runqueue_sort(struct vcpu *v)
-{
- list_insert_sort(RUNQ(v->processor), LIST(v), runq_comp);
-}
-
-
-static void sedf_insert_vcpu(const struct scheduler *ops, struct vcpu *v)
-{
- if ( !is_idle_vcpu(v) )
- {
- extraq_check(v);
- }
- else
- {
- EDOM_INFO(v)->deadl_abs = 0;
- EDOM_INFO(v)->status &= ~SEDF_ASLEEP;
- }
-}
-
-static void *sedf_alloc_vdata(const struct scheduler *ops, struct vcpu *v, void *dd)
-{
- struct sedf_vcpu_info *inf;
-
- inf = xzalloc(struct sedf_vcpu_info);
- if ( inf == NULL )
- return NULL;
-
- inf->vcpu = v;
-
- /* Every VCPU gets an equal share of extratime by default */
- inf->deadl_abs = 0;
- inf->latency = 0;
- inf->status = EXTRA_AWARE | SEDF_ASLEEP;
- inf->extraweight = 1;
- /* Upon creation all domain are best-effort */
- inf->period = WEIGHT_PERIOD;
- inf->slice = 0;
-
- inf->period_orig = inf->period; inf->slice_orig = inf->slice;
- INIT_LIST_HEAD(&(inf->list));
- INIT_LIST_HEAD(&(inf->extralist[EXTRA_PEN_Q]));
- INIT_LIST_HEAD(&(inf->extralist[EXTRA_UTIL_Q]));
-
- SCHED_STAT_CRANK(vcpu_init);
-
- return inf;
-}
-
-static void *
-sedf_alloc_pdata(const struct scheduler *ops, int cpu)
-{
- struct sedf_cpu_info *spc;
-
- spc = xzalloc(struct sedf_cpu_info);
- BUG_ON(spc == NULL);
- INIT_LIST_HEAD(&spc->waitq);
- INIT_LIST_HEAD(&spc->runnableq);
- INIT_LIST_HEAD(&spc->extraq[EXTRA_PEN_Q]);
- INIT_LIST_HEAD(&spc->extraq[EXTRA_UTIL_Q]);
-
- return (void *)spc;
-}
-
-static void
-sedf_free_pdata(const struct scheduler *ops, void *spc, int cpu)
-{
- if ( spc == NULL )
- return;
-
- xfree(spc);
-}
-
-static void sedf_free_vdata(const struct scheduler *ops, void *priv)
-{
- xfree(priv);
-}
-
-static void *
-sedf_alloc_domdata(const struct scheduler *ops, struct domain *d)
-{
- return xzalloc(struct sedf_dom_info);
-}
-
-static int sedf_init_domain(const struct scheduler *ops, struct domain *d)
-{
- d->sched_priv = sedf_alloc_domdata(ops, d);
- if ( d->sched_priv == NULL )
- return -ENOMEM;
-
- return 0;
-}
-
-static void sedf_free_domdata(const struct scheduler *ops, void *data)
-{
- xfree(data);
-}
-
-static void sedf_destroy_domain(const struct scheduler *ops, struct domain *d)
-{
- sedf_free_domdata(ops, d->sched_priv);
-}
-
-static int sedf_pick_cpu(const struct scheduler *ops, struct vcpu *v)
-{
- cpumask_t online_affinity;
- cpumask_t *online;
-
- online = cpupool_scheduler_cpumask(v->domain->cpupool);
- cpumask_and(&online_affinity, v->cpu_hard_affinity, online);
- return cpumask_cycle(v->vcpu_id % cpumask_weight(&online_affinity) - 1,
- &online_affinity);
-}
-
-/*
- * Handles the rescheduling & bookkeeping of domains running in their
- * guaranteed timeslice.
- */
-static void desched_edf_dom(s_time_t now, struct vcpu* d)
-{
- struct sedf_vcpu_info* inf = EDOM_INFO(d);
-
- /* Current domain is running in real time mode */
- ASSERT(__task_on_queue(d));
-
- /* Update the domain's cputime */
- inf->cputime += now - inf->sched_start_abs;
-
- /* Scheduling decisions which don't remove the running domain from
- * the runq */
- if ( (inf->cputime < inf->slice) && sedf_runnable(d) )
- return;
-
- __del_from_queue(d);
-
- /*
- * Manage bookkeeping (i.e. calculate next deadline, memorise
- * overrun-time of slice) of finished domains.
- */
- if ( inf->cputime >= inf->slice )
- {
- inf->cputime -= inf->slice;
-
- if ( inf->period < inf->period_orig )
- {
- /* This domain runs in latency scaling or burst mode */
- inf->period *= 2;
- inf->slice *= 2;
- if ( (inf->period > inf->period_orig) ||
- (inf->slice > inf->slice_orig) )
- {
- /* Reset slice and period */
- inf->period = inf->period_orig;
- inf->slice = inf->slice_orig;
- }
- }
-
- /* Set next deadline */
- inf->deadl_abs += inf->period;
- }
-
- /* Add a runnable domain to the waitqueue */
- if ( sedf_runnable(d) )
- {
- __add_to_waitqueue_sort(d);
- }
- else
- {
- /* We have a blocked realtime task -> remove it from exqs too */
- if ( extraq_on(d, EXTRA_PEN_Q) )
- extraq_del(d, EXTRA_PEN_Q);
- if ( extraq_on(d, EXTRA_UTIL_Q) )
- extraq_del(d, EXTRA_UTIL_Q);
- }
-
- ASSERT(EQ(sedf_runnable(d), __task_on_queue(d)));
- ASSERT(IMPLY(extraq_on(d, EXTRA_UTIL_Q) || extraq_on(d, EXTRA_PEN_Q),
- sedf_runnable(d)));
-}
-
-
-/* Update all elements on the queues */
-static void update_queues(
- s_time_t now, struct list_head *runq, struct list_head *waitq)
-{
- struct list_head *cur, *tmp;
- struct sedf_vcpu_info *curinf;
-
- /*
- * Check for the first elements of the waitqueue, whether their
- * next period has already started.
- */
- list_for_each_safe ( cur, tmp, waitq )
- {
- curinf = list_entry(cur, struct sedf_vcpu_info, list);
- if ( PERIOD_BEGIN(curinf) > now )
- break;
- __del_from_queue(curinf->vcpu);
- __add_to_runqueue_sort(curinf->vcpu);
- }
-
- /* Process the runq, find domains that are on the runq that shouldn't */
- list_for_each_safe ( cur, tmp, runq )
- {
- curinf = list_entry(cur,struct sedf_vcpu_info,list);
-
- if ( unlikely(curinf->slice == 0) )
- {
- /* Ignore domains with empty slice */
- __del_from_queue(curinf->vcpu);
-
- /* Move them to their next period */
- curinf->deadl_abs += curinf->period;
-
- /* Ensure that the start of the next period is in the future */
- if ( unlikely(PERIOD_BEGIN(curinf) < now) )
- curinf->deadl_abs +=
- (DIV_UP(now - PERIOD_BEGIN(curinf),
- curinf->period)) * curinf->period;
-
- /* Put them back into the queue */
- __add_to_waitqueue_sort(curinf->vcpu);
- }
- else if ( unlikely((curinf->deadl_abs < now) ||
- (curinf->cputime > curinf->slice)) )
- {
- /*
- * We missed the deadline or the slice was already finished.
- * Might hapen because of dom_adj.
- */
- printk("\tDomain %i.%i exceeded it's deadline/"
- "slice (%"PRIu64" / %"PRIu64") now: %"PRIu64
- " cputime: %"PRIu64"\n",
- curinf->vcpu->domain->domain_id,
- curinf->vcpu->vcpu_id,
- curinf->deadl_abs, curinf->slice, now,
- curinf->cputime);
- __del_from_queue(curinf->vcpu);
-
- /* Common case: we miss one period */
- curinf->deadl_abs += curinf->period;
-
- /*
- * If we are still behind: modulo arithmetic, force deadline
- * to be in future and aligned to period borders.
- */
- if ( unlikely(curinf->deadl_abs < now) )
- curinf->deadl_abs +=
- DIV_UP(now - curinf->deadl_abs,
- curinf->period) * curinf->period;
- ASSERT(curinf->deadl_abs >= now);
-
- /* Give a fresh slice */
- curinf->cputime = 0;
- if ( PERIOD_BEGIN(curinf) > now )
- __add_to_waitqueue_sort(curinf->vcpu);
- else
- __add_to_runqueue_sort(curinf->vcpu);
- }
- else
- break;
- }
-}
-
-
-/*
- * removes a domain from the head of the according extraQ and
- * requeues it at a specified position:
- * round-robin extratime: end of extraQ
- * weighted ext.: insert in sorted list by score
- * if the domain is blocked / has regained its short-block-loss
- * time it is not put on any queue.
- */
-static void desched_extra_dom(s_time_t now, struct vcpu *d)
-{
- struct sedf_vcpu_info *inf = EDOM_INFO(d);
- int i = extra_get_cur_q(inf);
- unsigned long oldscore;
-
- ASSERT(extraq_on(d, i));
-
- /* Unset all running flags */
- inf->status &= ~(EXTRA_RUN_PEN | EXTRA_RUN_UTIL);
- /* Fresh slice for the next run */
- inf->cputime = 0;
- /* Accumulate total extratime */
- inf->extra_time_tot += now - inf->sched_start_abs;
- /* Remove extradomain from head of the queue. */
- extraq_del(d, i);
-
- /* Update the score */
- oldscore = inf->score[i];
- if ( i == EXTRA_PEN_Q )
- {
- /* Domain was running in L0 extraq */
- /* reduce block lost, probably more sophistication here!*/
- /*inf->short_block_lost_tot -= EXTRA_QUANTUM;*/
- inf->short_block_lost_tot -= now - inf->sched_start_abs;
-#if 0
- /* KAF: If we don't exit short-blocking state at this point
- * domain0 can steal all CPU for up to 10 seconds before
- * scheduling settles down (when competing against another
- * CPU-bound domain). Doing this seems to make things behave
- * nicely. Noone gets starved by default.
- */
- if ( inf->short_block_lost_tot <= 0 )
-#endif
- {
- /* We have (over-)compensated our block penalty */
- inf->short_block_lost_tot = 0;
- /* We don't want a place on the penalty queue anymore! */
- inf->status &= ~EXTRA_WANT_PEN_Q;
- goto check_extra_queues;
- }
-
- /*
- * We have to go again for another try in the block-extraq,
- * the score is not used incremantally here, as this is
- * already done by recalculating the block_lost
- */
- inf->score[EXTRA_PEN_Q] = (inf->period << 10) /
- inf->short_block_lost_tot;
- oldscore = 0;
- }
- else
- {
- /*
- * Domain was running in L1 extraq => score is inverse of
- * utilization and is used somewhat incremental!
- */
- if ( !inf->extraweight )
- {
- /* NB: use fixed point arithmetic with 10 bits */
- inf->score[EXTRA_UTIL_Q] = (inf->period << 10) /
- inf->slice;
- }
- else
- {
- /*
- * Conversion between realtime utilisation and extrawieght:
- * full (ie 100%) utilization is equivalent to 128 extraweight
- */
- inf->score[EXTRA_UTIL_Q] = (1<<17) / inf->extraweight;
- }
- }
-
- check_extra_queues:
- /* Adding a runnable domain to the right queue and removing blocked ones */
- if ( sedf_runnable(d) )
- {
- /* Add according to score: weighted round robin */
- if (((inf->status & EXTRA_AWARE) && (i == EXTRA_UTIL_Q)) ||
- ((inf->status & EXTRA_WANT_PEN_Q) && (i == EXTRA_PEN_Q)))
- extraq_add_sort_update(d, i, oldscore);
- }
- else
- {
- /* Remove this blocked domain from the waitq! */
- __del_from_queue(d);
- /* Make sure that we remove a blocked domain from the other
- * extraq too. */
- if ( i == EXTRA_PEN_Q )
- {
- if ( extraq_on(d, EXTRA_UTIL_Q) )
- extraq_del(d, EXTRA_UTIL_Q);
- }
- else
- {
- if ( extraq_on(d, EXTRA_PEN_Q) )
- extraq_del(d, EXTRA_PEN_Q);
- }
- }
-
- ASSERT(EQ(sedf_runnable(d), __task_on_queue(d)));
- ASSERT(IMPLY(extraq_on(d, EXTRA_UTIL_Q) || extraq_on(d, EXTRA_PEN_Q),
- sedf_runnable(d)));
-}
-
-
-static struct task_slice sedf_do_extra_schedule(
- s_time_t now, s_time_t end_xt, struct list_head *extraq[], int cpu)
-{
- struct task_slice ret = { 0 };
- struct sedf_vcpu_info *runinf;
- ASSERT(end_xt > now);
-
- /* Enough time left to use for extratime? */
- if ( end_xt - now < EXTRA_QUANTUM )
- goto return_idle;
-
- if ( !list_empty(extraq[EXTRA_PEN_Q]) )
- {
- /*
- * We still have elements on the level 0 extraq
- * => let those run first!
- */
- runinf = list_entry(extraq[EXTRA_PEN_Q]->next,
- struct sedf_vcpu_info, extralist[EXTRA_PEN_Q]);
- runinf->status |= EXTRA_RUN_PEN;
- ret.task = runinf->vcpu;
- ret.time = EXTRA_QUANTUM;
-#ifdef SEDF_STATS
- runinf->pen_extra_slices++;
-#endif
- }
- else
- {
- if ( !list_empty(extraq[EXTRA_UTIL_Q]) )
- {
- /* Use elements from the normal extraqueue */
- runinf = list_entry(extraq[EXTRA_UTIL_Q]->next,
- struct sedf_vcpu_info,
- extralist[EXTRA_UTIL_Q]);
- runinf->status |= EXTRA_RUN_UTIL;
- ret.task = runinf->vcpu;
- ret.time = EXTRA_QUANTUM;
- }
- else
- goto return_idle;
- }
-
- ASSERT(ret.time > 0);
- ASSERT(sedf_runnable(ret.task));
- return ret;
-
- return_idle:
- ret.task = IDLETASK(cpu);
- ret.time = end_xt - now;
- ASSERT(ret.time > 0);
- ASSERT(sedf_runnable(ret.task));
- return ret;
-}
-
-
-static int sedf_init(struct scheduler *ops)
-{
- struct sedf_priv_info *prv;
-
- prv = xzalloc(struct sedf_priv_info);
- if ( prv == NULL )
- return -ENOMEM;
-
- ops->sched_data = prv;
- spin_lock_init(&prv->lock);
-
- return 0;
-}
-
-
-static void sedf_deinit(const struct scheduler *ops)
-{
- struct sedf_priv_info *prv;
-
- prv = SEDF_PRIV(ops);
- xfree(prv);
-}
-
-
-/*
- * Main scheduling function
- * Reasons for calling this function are:
- * -timeslice for the current period used up
- * -domain on waitqueue has started it's period
- * -and various others ;) in general: determine which domain to run next
- */
-static struct task_slice sedf_do_schedule(
- const struct scheduler *ops, s_time_t now, bool_t tasklet_work_scheduled)
-{
- int cpu = smp_processor_id();
- struct list_head *runq = RUNQ(cpu);
- struct list_head *waitq = WAITQ(cpu);
- struct sedf_vcpu_info *inf = EDOM_INFO(current);
- struct list_head *extraq[] = {
- EXTRAQ(cpu, EXTRA_PEN_Q), EXTRAQ(cpu, EXTRA_UTIL_Q)};
- struct sedf_vcpu_info *runinf, *waitinf;
- struct task_slice ret;
-
- SCHED_STAT_CRANK(schedule);
-
- /* Idle tasks don't need any of the following stuf */
- if ( is_idle_vcpu(current) )
- goto check_waitq;
-
- /*
- * Create local state of the status of the domain, in order to avoid
- * inconsistent state during scheduling decisions, because data for
- * vcpu_runnable is not protected by the scheduling lock!
- */
- if ( !vcpu_runnable(current) )
- inf->status |= SEDF_ASLEEP;
-
- if ( inf->status & SEDF_ASLEEP )
- inf->block_abs = now;
-
- if ( unlikely(extra_runs(inf)) )
- {
- /* Special treatment of domains running in extra time */
- desched_extra_dom(now, current);
- }
- else
- {
- desched_edf_dom(now, current);
- }
- check_waitq:
- update_queues(now, runq, waitq);
-
- /*
- * Now simply pick the first domain from the runqueue, which has the
- * earliest deadline, because the list is sorted
- *
- * Tasklet work (which runs in idle VCPU context) overrides all else.
- */
- if ( tasklet_work_scheduled ||
- (list_empty(runq) && list_empty(waitq)) ||
- unlikely(!cpumask_test_cpu(cpu,
- cpupool_scheduler_cpumask(per_cpu(cpupool, cpu)))) )
- {
- ret.task = IDLETASK(cpu);
- ret.time = SECONDS(1);
- }
- else if ( !list_empty(runq) )
- {
- runinf = list_entry(runq->next,struct sedf_vcpu_info,list);
- ret.task = runinf->vcpu;
- if ( !list_empty(waitq) )
- {
- waitinf = list_entry(waitq->next,
- struct sedf_vcpu_info,list);
- /*
- * Rerun scheduler, when scheduled domain reaches it's
- * end of slice or the first domain from the waitqueue
- * gets ready.
- */
- ret.time = MIN(now + runinf->slice - runinf->cputime,
- PERIOD_BEGIN(waitinf)) - now;
- }
- else
- {
- ret.time = runinf->slice - runinf->cputime;
- }
- }
- else
- {
- waitinf = list_entry(waitq->next,struct sedf_vcpu_info, list);
- /*
- * We could not find any suitable domain
- * => look for domains that are aware of extratime
- */
- ret = sedf_do_extra_schedule(now, PERIOD_BEGIN(waitinf),
- extraq, cpu);
- }
-
- /*
- * TODO: Do something USEFUL when this happens and find out, why it
- * still can happen!!!
- */
- if ( ret.time < 0)
- {
- printk("Ouch! We are seriously BEHIND schedule! %"PRIi64"\n",
- ret.time);
- ret.time = EXTRA_QUANTUM;
- }
-
- ret.migrated = 0;
-
- EDOM_INFO(ret.task)->sched_start_abs = now;
- CHECK(ret.time > 0);
- ASSERT(sedf_runnable(ret.task));
- CPU_INFO(cpu)->current_slice_expires = now + ret.time;
- return ret;
-}
-
-
-static void sedf_sleep(const struct scheduler *ops, struct vcpu *d)
-{
- if ( is_idle_vcpu(d) )
- return;
-
- EDOM_INFO(d)->status |= SEDF_ASLEEP;
-
- if ( per_cpu(schedule_data, d->processor).curr == d )
- {
- cpu_raise_softirq(d->processor, SCHEDULE_SOFTIRQ);
- }
- else
- {
- if ( __task_on_queue(d) )
- __del_from_queue(d);
- if ( extraq_on(d, EXTRA_UTIL_Q) )
- extraq_del(d, EXTRA_UTIL_Q);
- if ( extraq_on(d, EXTRA_PEN_Q) )
- extraq_del(d, EXTRA_PEN_Q);
- }
-}
-
-
-/*
- * This function wakes up a domain, i.e. moves them into the waitqueue
- * things to mention are: admission control is taking place nowhere at
- * the moment, so we can't be sure, whether it is safe to wake the domain
- * up at all. Anyway, even if it is safe (total cpu usage <=100%) there are
- * some considerations on when to allow the domain to wake up and have it's
- * first deadline...
- * I detected 3 cases, which could describe the possible behaviour of the
- * scheduler,
- * and I'll try to make them more clear:
- *
- * 1. Very conservative
- * -when a blocked domain unblocks, it is allowed to start execution at
- * the beginning of the next complete period
- * (D..deadline, R..running, B..blocking/sleeping, U..unblocking/waking up
- *
- * DRRB_____D__U_____DRRRRR___D________ ...
- *
- * -this causes the domain to miss a period (and a deadlline)
- * -doesn't disturb the schedule at all
- * -deadlines keep occuring isochronous
- *
- * 2. Conservative Part 1: Short Unblocking
- * -when a domain unblocks in the same period as it was blocked it
- * unblocks and may consume the rest of it's original time-slice minus
- * the time it was blocked
- * (assume period=9, slice=5)
- *
- * DRB_UR___DRRRRR___D...
- *
- * -this also doesn't disturb scheduling, but might lead to the fact, that
- * the domain can't finish it's workload in the period
- * -in addition to that the domain can be treated prioritised when
- * extratime is available
- * -addition: experiments have shown that this may have a HUGE impact on
- * performance of other domains, becaus it can lead to excessive context
- * switches
- *
- * Part2: Long Unblocking
- * Part 2a
- * -it is obvious that such accounting of block time, applied when
- * unblocking is happening in later periods, works fine aswell
- * -the domain is treated as if it would have been running since the start
- * of its new period
- *
- * DRB______D___UR___D...
- *
- * Part 2b
- * -if one needs the full slice in the next period, it is necessary to
- * treat the unblocking time as the start of the new period, i.e. move
- * the deadline further back (later)
- * -this doesn't disturb scheduling as well, because for EDF periods can
- * be treated as minimal inter-release times and scheduling stays
- * correct, when deadlines are kept relative to the time the process
- * unblocks
- *
- * DRB______D___URRRR___D...<prev [Thread] next>
- * (D) <- old deadline was here
- * -problem: deadlines don't occur isochronous anymore
- * Part 2c (Improved Atropos design)
- * -when a domain unblocks it is given a very short period (=latency hint)
- * and slice length scaled accordingly
- * -both rise again to the original value (e.g. get doubled every period)
- *
- * 3. Unconservative (i.e. incorrect)
- * -to boost the performance of I/O dependent domains it would be possible
- * to put the domain into the runnable queue immediately, and let it run
- * for the remainder of the slice of the current period
- * (or even worse: allocate a new full slice for the domain)
- * -either behaviour can lead to missed deadlines in other domains as
- * opposed to approaches 1,2a,2b
- */
-static void unblock_short_extra_support(
- struct sedf_vcpu_info* inf, s_time_t now)
-{
- /*
- * This unblocking scheme tries to support the domain, by assigning it
- * a priority in extratime distribution according to the loss of time
- * in this slice due to blocking
- */
- s_time_t pen;
-
- /* No more realtime execution in this period! */
- inf->deadl_abs += inf->period;
- if ( likely(inf->block_abs) )
- {
- /* Treat blocked time as consumed by the domain */
- /*inf->cputime += now - inf->block_abs;*/
- /*
- * Penalty is time the domain would have
- * had if it continued to run.
- */
- pen = (inf->slice - inf->cputime);
- if ( pen < 0 )
- pen = 0;
- /* Accumulate all penalties over the periods */
- /*inf->short_block_lost_tot += pen;*/
- /* Set penalty to the current value */
- inf->short_block_lost_tot = pen;
- /* Not sure which one is better.. but seems to work well... */
-
- if ( inf->short_block_lost_tot )
- {
- inf->score[0] = (inf->period << 10) /
- inf->short_block_lost_tot;
-#ifdef SEDF_STATS
- inf->pen_extra_blocks++;
-#endif
- if ( extraq_on(inf->vcpu, EXTRA_PEN_Q) )
- /* Remove domain for possible resorting! */
- extraq_del(inf->vcpu, EXTRA_PEN_Q);
- else
- /*
- * Remember that we want to be on the penalty q
- * so that we can continue when we (un-)block
- * in penalty-extratime
- */
- inf->status |= EXTRA_WANT_PEN_Q;
-
- /* (re-)add domain to the penalty extraq */
- extraq_add_sort_update(inf->vcpu, EXTRA_PEN_Q, 0);
- }
- }
-
- /* Give it a fresh slice in the next period! */
- inf->cputime = 0;
-}
-
-
-static void unblock_long_cons_b(struct sedf_vcpu_info* inf,s_time_t now)
-{
- /* Conservative 2b */
-
- /* Treat the unblocking time as a start of a new period */
- inf->deadl_abs = now + inf->period;
- inf->cputime = 0;
-}
-
-
-#define DOMAIN_EDF 1
-#define DOMAIN_EXTRA_PEN 2
-#define DOMAIN_EXTRA_UTIL 3
-#define DOMAIN_IDLE 4
-static inline int get_run_type(struct vcpu* d)
-{
- struct sedf_vcpu_info* inf = EDOM_INFO(d);
- if (is_idle_vcpu(d))
- return DOMAIN_IDLE;
- if (inf->status & EXTRA_RUN_PEN)
- return DOMAIN_EXTRA_PEN;
- if (inf->status & EXTRA_RUN_UTIL)
- return DOMAIN_EXTRA_UTIL;
- return DOMAIN_EDF;
-}
-
-
-/*
- * Compares two domains in the relation of whether the one is allowed to
- * interrupt the others execution.
- * It returns true (!=0) if a switch to the other domain is good.
- * Current Priority scheme is as follows:
- * EDF > L0 (penalty based) extra-time >
- * L1 (utilization) extra-time > idle-domain
- * In the same class priorities are assigned as following:
- * EDF: early deadline > late deadline
- * L0 extra-time: lower score > higher score
- */
-static inline int should_switch(struct vcpu *cur,
- struct vcpu *other,
- s_time_t now)
-{
- struct sedf_vcpu_info *cur_inf, *other_inf;
- cur_inf = EDOM_INFO(cur);
- other_inf = EDOM_INFO(other);
-
- /* Check whether we need to make an earlier scheduling decision */
- if ( PERIOD_BEGIN(other_inf) <
- CPU_INFO(other->processor)->current_slice_expires )
- return 1;
-
- /* No timing-based switches need to be taken into account here */
- switch ( get_run_type(cur) )
- {
- case DOMAIN_EDF:
- /* Do not interrupt a running EDF domain */
- return 0;
- case DOMAIN_EXTRA_PEN:
- /* Check whether we also want the L0 ex-q with lower score */
- return ((other_inf->status & EXTRA_WANT_PEN_Q) &&
- (other_inf->score[EXTRA_PEN_Q] <
- cur_inf->score[EXTRA_PEN_Q]));
- case DOMAIN_EXTRA_UTIL:
- /* Check whether we want the L0 extraq. Don't
- * switch if both domains want L1 extraq. */
- return !!(other_inf->status & EXTRA_WANT_PEN_Q);
- case DOMAIN_IDLE:
- return 1;
- }
-
- return 1;
-}
-
-static void sedf_wake(const struct scheduler *ops, struct vcpu *d)
-{
- s_time_t now = NOW();
- struct sedf_vcpu_info* inf = EDOM_INFO(d);
-
- if ( unlikely(is_idle_vcpu(d)) )
- return;
-
- if ( unlikely(__task_on_queue(d)) )
- return;
-
- ASSERT(!sedf_runnable(d));
- inf->status &= ~SEDF_ASLEEP;
- ASSERT(!extraq_on(d, EXTRA_UTIL_Q));
- ASSERT(!extraq_on(d, EXTRA_PEN_Q));
-
- if ( unlikely(inf->deadl_abs == 0) )
- {
- /* Initial setup of the deadline */
- inf->deadl_abs = now + inf->slice;
- }
-
-#ifdef SEDF_STATS
- inf->block_tot++;
-#endif
-
- if ( unlikely(now < PERIOD_BEGIN(inf)) )
- {
- /* Unblocking in extra-time! */
- if ( inf->status & EXTRA_WANT_PEN_Q )
- {
- /*
- * We have a domain that wants compensation
- * for block penalty and did just block in
- * its compensation time. Give it another
- * chance!
- */
- extraq_add_sort_update(d, EXTRA_PEN_Q, 0);
- }
- extraq_check_add_unblocked(d, 0);
- }
- else
- {
- if ( now < inf->deadl_abs )
- {
- /* Short blocking */
-#ifdef SEDF_STATS
- inf->short_block_tot++;
-#endif
- unblock_short_extra_support(inf, now);
-
- extraq_check_add_unblocked(d, 1);
- }
- else
- {
- /* Long unblocking */
-#ifdef SEDF_STATS
- inf->long_block_tot++;
-#endif
- unblock_long_cons_b(inf, now);
-
- extraq_check_add_unblocked(d, 1);
- }
- }
-
- if ( PERIOD_BEGIN(inf) > now )
- __add_to_waitqueue_sort(d);
- else
- __add_to_runqueue_sort(d);
-
-#ifdef SEDF_STATS
- /* Do some statistics here... */
- if ( inf->block_abs != 0 )
- {
- inf->block_time_tot += now - inf->block_abs;
- inf->penalty_time_tot +=
- PERIOD_BEGIN(inf) + inf->cputime - inf->block_abs;
- }
-#endif
-
- /* Sanity check: make sure each extra-aware domain IS on the util-q! */
- ASSERT(IMPLY(inf->status & EXTRA_AWARE, extraq_on(d, EXTRA_UTIL_Q)));
- ASSERT(__task_on_queue(d));
- /*
- * Check whether the awakened task needs to invoke the do_schedule
- * routine. Try to avoid unnecessary runs but:
- * Save approximation: Always switch to scheduler!
- */
- ASSERT(d->processor >= 0);
- ASSERT(d->processor < nr_cpu_ids);
- ASSERT(per_cpu(schedule_data, d->processor).curr);
-
- if ( should_switch(per_cpu(schedule_data, d->processor).curr, d, now) )
- cpu_raise_softirq(d->processor, SCHEDULE_SOFTIRQ);
-}
-
-
-/* Print a lot of useful information about a domains in the system */
-static void sedf_dump_domain(struct vcpu *d)
-{
- printk("%i.%i has=%c ", d->domain->domain_id, d->vcpu_id,
- d->is_running ? 'T':'F');
- printk("p=%"PRIu64" sl=%"PRIu64" ddl=%"PRIu64" w=%hu"
- " sc=%i xtr(%s)=%"PRIu64" ew=%hu",
- EDOM_INFO(d)->period, EDOM_INFO(d)->slice, EDOM_INFO(d)->deadl_abs,
- EDOM_INFO(d)->weight,
- EDOM_INFO(d)->score[EXTRA_UTIL_Q],
- (EDOM_INFO(d)->status & EXTRA_AWARE) ? "yes" : "no",
- EDOM_INFO(d)->extra_time_tot, EDOM_INFO(d)->extraweight);
-
-#ifdef SEDF_STATS
- if ( EDOM_INFO(d)->block_time_tot != 0 )
- printk(" pen=%"PRIu64"%%", (EDOM_INFO(d)->penalty_time_tot * 100) /
- EDOM_INFO(d)->block_time_tot);
- if ( EDOM_INFO(d)->block_tot != 0 )
- printk("\n blks=%u sh=%u (%u%%) (shex=%i "\
- "shexsl=%i) l=%u (%u%%) avg: b=%"PRIu64" p=%"PRIu64"",
- EDOM_INFO(d)->block_tot, EDOM_INFO(d)->short_block_tot,
- (EDOM_INFO(d)->short_block_tot * 100) / EDOM_INFO(d)->block_tot,
- EDOM_INFO(d)->pen_extra_blocks,
- EDOM_INFO(d)->pen_extra_slices,
- EDOM_INFO(d)->long_block_tot,
- (EDOM_INFO(d)->long_block_tot * 100) / EDOM_INFO(d)->block_tot,
- (EDOM_INFO(d)->block_time_tot) / EDOM_INFO(d)->block_tot,
- (EDOM_INFO(d)->penalty_time_tot) / EDOM_INFO(d)->block_tot);
-#endif
- printk("\n");
-}
-
-
-/* Dumps all domains on the specified cpu */
-static void sedf_dump_cpu_state(const struct scheduler *ops, int i)
-{
- struct sedf_priv_info *prv = SEDF_PRIV(ops);
- struct list_head *list, *queue, *tmp;
- struct sedf_vcpu_info *d_inf;
- struct domain *d;
- struct vcpu *ed;
- spinlock_t *lock;
- unsigned long flags;
- int loop = 0;
-
- /*
- * We need both locks, as:
- * - we access domains' parameters, which are protected by the
- * private scheduler lock;
- * - we scan through the various queues, so we need the proper
- * runqueue lock (i.e., the one for this pCPU).
- */
- spin_lock_irqsave(&prv->lock, flags);
- lock = pcpu_schedule_lock(i);
-
- printk("now=%"PRIu64"\n",NOW());
- queue = RUNQ(i);
- printk("RUNQ rq %lx n: %lx, p: %lx\n", (unsigned long)queue,
- (unsigned long) queue->next, (unsigned long) queue->prev);
- list_for_each_safe ( list, tmp, queue )
- {
- printk("%3d: ",loop++);
- d_inf = list_entry(list, struct sedf_vcpu_info, list);
- sedf_dump_domain(d_inf->vcpu);
- }
-
- queue = WAITQ(i); loop = 0;
- printk("\nWAITQ rq %lx n: %lx, p: %lx\n", (unsigned long)queue,
- (unsigned long) queue->next, (unsigned long) queue->prev);
- list_for_each_safe ( list, tmp, queue )
- {
- printk("%3d: ",loop++);
- d_inf = list_entry(list, struct sedf_vcpu_info, list);
- sedf_dump_domain(d_inf->vcpu);
- }
-
- queue = EXTRAQ(i,EXTRA_PEN_Q); loop = 0;
- printk("\nEXTRAQ (penalty) rq %lx n: %lx, p: %lx\n",
- (unsigned long)queue, (unsigned long) queue->next,
- (unsigned long) queue->prev);
- list_for_each_safe ( list, tmp, queue )
- {
- d_inf = list_entry(list, struct sedf_vcpu_info,
- extralist[EXTRA_PEN_Q]);
- printk("%3d: ",loop++);
- sedf_dump_domain(d_inf->vcpu);
- }
-
- queue = EXTRAQ(i,EXTRA_UTIL_Q); loop = 0;
- printk("\nEXTRAQ (utilization) rq %lx n: %lx, p: %lx\n",
- (unsigned long)queue, (unsigned long) queue->next,
- (unsigned long) queue->prev);
- list_for_each_safe ( list, tmp, queue )
- {
- d_inf = list_entry(list, struct sedf_vcpu_info,
- extralist[EXTRA_UTIL_Q]);
- printk("%3d: ",loop++);
- sedf_dump_domain(d_inf->vcpu);
- }
-
- loop = 0;
- printk("\nnot on Q\n");
-
- rcu_read_lock(&domlist_read_lock);
- for_each_domain ( d )
- {
- if ( (d->cpupool ? d->cpupool->sched : &sched_sedf_def) != ops )
- continue;
- for_each_vcpu(d, ed)
- {
- if ( !__task_on_queue(ed) && (ed->processor == i) )
- {
- printk("%3d: ",loop++);
- sedf_dump_domain(ed);
- }
- }
- }
- rcu_read_unlock(&domlist_read_lock);
-
- pcpu_schedule_unlock(lock, i);
- spin_unlock_irqrestore(&prv->lock, flags);
-}
-
-
-/* Adjusts periods and slices of the domains accordingly to their weights */
-static int sedf_adjust_weights(struct cpupool *c, int nr_cpus, int *sumw, s_time_t *sumt)
-{
- struct vcpu *p;
- struct domain *d;
- unsigned int cpu;
-
- /*
- * Sum across all weights. Notice that no runq locking is needed
- * here: the caller holds sedf_priv_info.lock and we're not changing
- * anything that is accessed during scheduling.
- */
- rcu_read_lock(&domlist_read_lock);
- for_each_domain_in_cpupool( d, c )
- {
- for_each_vcpu( d, p )
- {
- if ( (cpu = p->processor) >= nr_cpus )
- continue;
-
- if ( EDOM_INFO(p)->weight )
- {
- sumw[cpu] += EDOM_INFO(p)->weight;
- }
- else
- {
- /*
- * Don't modify domains who don't have a weight, but sum
- * up the time they need, projected to a WEIGHT_PERIOD,
- * so that this time is not given to the weight-driven
- * domains
- */
-
- /* Check for overflows */
- ASSERT((WEIGHT_PERIOD < ULONG_MAX)
- && (EDOM_INFO(p)->slice_orig < ULONG_MAX));
- sumt[cpu] +=
- (WEIGHT_PERIOD * EDOM_INFO(p)->slice_orig) /
- EDOM_INFO(p)->period_orig;
- }
- }
- }
- rcu_read_unlock(&domlist_read_lock);
-
- /*
- * Adjust all slices (and periods) to the new weight. Unlike above, we
- * need to take thr runq lock for the various VCPUs: we're modyfing
- * slice and period which are referenced during scheduling.
- */
- rcu_read_lock(&domlist_read_lock);
- for_each_domain_in_cpupool( d, c )
- {
- for_each_vcpu ( d, p )
- {
- if ( (cpu = p->processor) >= nr_cpus )
- continue;
- if ( EDOM_INFO(p)->weight )
- {
- /* Interrupts already off */
- spinlock_t *lock = vcpu_schedule_lock(p);
-
- EDOM_INFO(p)->period_orig =
- EDOM_INFO(p)->period = WEIGHT_PERIOD;
- EDOM_INFO(p)->slice_orig =
- EDOM_INFO(p)->slice =
- (EDOM_INFO(p)->weight *
- (WEIGHT_PERIOD - WEIGHT_SAFETY - sumt[cpu])) / sumw[cpu];
-
- vcpu_schedule_unlock(lock, p);
- }
- }
- }
- rcu_read_unlock(&domlist_read_lock);
-
- return 0;
-}
-
-
-/* Set or fetch domain scheduling parameters */
-static int sedf_adjust(const struct scheduler *ops, struct domain *p, struct xen_domctl_scheduler_op *op)
-{
- struct sedf_priv_info *prv = SEDF_PRIV(ops);
- unsigned long flags;
- unsigned int nr_cpus = cpumask_last(&cpu_online_map) + 1;
- int *sumw = xzalloc_array(int, nr_cpus);
- s_time_t *sumt = xzalloc_array(s_time_t, nr_cpus);
- struct vcpu *v;
- int rc = 0;
-
- /*
- * Serialize against the pluggable scheduler lock to protect from
- * concurrent updates. We need to take the runq lock for the VCPUs
- * as well, since we are touching extraweight, weight, slice and
- * period. As in sched_credit2.c, runq locks nest inside the
- * pluggable scheduler lock.
- */
- spin_lock_irqsave(&prv->lock, flags);
-
- if ( op->cmd == XEN_DOMCTL_SCHEDOP_putinfo )
- {
- /*
- * These are used in sedf_adjust_weights() but have to be allocated in
- * this function, as we need to avoid nesting xmem_pool_alloc's lock
- * within our prv->lock.
- */
- if ( !sumw || !sumt )
- {
- /* Check for errors here, the _getinfo branch doesn't care */
- rc = -ENOMEM;
- goto out;
- }
-
- /* Check for sane parameters */
- if ( !op->u.sedf.period && !op->u.sedf.weight )
- {
- rc = -EINVAL;
- goto out;
- }
-
- if ( op->u.sedf.weight )
- {
- if ( (op->u.sedf.extratime & EXTRA_AWARE) &&
- (!op->u.sedf.period) )
- {
- /* Weight-driven domains with extratime only */
- for_each_vcpu ( p, v )
- {
- /* (Here and everywhere in the following) IRQs are already off,
- * hence vcpu_spin_lock() is the one. */
- spinlock_t *lock = vcpu_schedule_lock(v);
-
- EDOM_INFO(v)->extraweight = op->u.sedf.weight;
- EDOM_INFO(v)->weight = 0;
- EDOM_INFO(v)->slice = 0;
- EDOM_INFO(v)->period = WEIGHT_PERIOD;
- vcpu_schedule_unlock(lock, v);
- }
- }
- else
- {
- /* Weight-driven domains with real-time execution */
- for_each_vcpu ( p, v )
- {
- spinlock_t *lock = vcpu_schedule_lock(v);
-
- EDOM_INFO(v)->weight = op->u.sedf.weight;
- vcpu_schedule_unlock(lock, v);
- }
- }
- }
- else
- {
- /*
- * Sanity checking: note that disabling extra weight requires
- * that we set a non-zero slice.
- */
- if ( (op->u.sedf.period > PERIOD_MAX) ||
- (op->u.sedf.period < PERIOD_MIN) ||
- (op->u.sedf.slice > op->u.sedf.period) ||
- (op->u.sedf.slice < SLICE_MIN) )
- {
- rc = -EINVAL;
- goto out;
- }
-
- /* Time-driven domains */
- for_each_vcpu ( p, v )
- {
- spinlock_t *lock = vcpu_schedule_lock(v);
-
- EDOM_INFO(v)->weight = 0;
- EDOM_INFO(v)->extraweight = 0;
- EDOM_INFO(v)->period_orig =
- EDOM_INFO(v)->period = op->u.sedf.period;
- EDOM_INFO(v)->slice_orig =
- EDOM_INFO(v)->slice = op->u.sedf.slice;
- vcpu_schedule_unlock(lock, v);
- }
- }
-
- rc = sedf_adjust_weights(p->cpupool, nr_cpus, sumw, sumt);
- if ( rc )
- goto out;
-
- for_each_vcpu ( p, v )
- {
- spinlock_t *lock = vcpu_schedule_lock(v);
-
- EDOM_INFO(v)->status =
- (EDOM_INFO(v)->status &
- ~EXTRA_AWARE) | (op->u.sedf.extratime & EXTRA_AWARE);
- EDOM_INFO(v)->latency = op->u.sedf.latency;
- extraq_check(v);
- vcpu_schedule_unlock(lock, v);
- }
- }
- else if ( op->cmd == XEN_DOMCTL_SCHEDOP_getinfo )
- {
- if ( p->vcpu[0] == NULL )
- {
- rc = -EINVAL;
- goto out;
- }
-
- op->u.sedf.period = EDOM_INFO(p->vcpu[0])->period;
- op->u.sedf.slice = EDOM_INFO(p->vcpu[0])->slice;
- op->u.sedf.extratime = EDOM_INFO(p->vcpu[0])->status & EXTRA_AWARE;
- op->u.sedf.latency = EDOM_INFO(p->vcpu[0])->latency;
- op->u.sedf.weight = EDOM_INFO(p->vcpu[0])->weight;
- }
-
-out:
- spin_unlock_irqrestore(&prv->lock, flags);
-
- xfree(sumt);
- xfree(sumw);
-
- return rc;
-}
-
-static struct sedf_priv_info _sedf_priv;
-
-const struct scheduler sched_sedf_def = {
- .name = "Simple EDF Scheduler",
- .opt_name = "sedf",
- .sched_id = XEN_SCHEDULER_SEDF,
- .sched_data = &_sedf_priv,
-
- .init_domain = sedf_init_domain,
- .destroy_domain = sedf_destroy_domain,
-
- .insert_vcpu = sedf_insert_vcpu,
-
- .alloc_vdata = sedf_alloc_vdata,
- .free_vdata = sedf_free_vdata,
- .alloc_pdata = sedf_alloc_pdata,
- .free_pdata = sedf_free_pdata,
- .alloc_domdata = sedf_alloc_domdata,
- .free_domdata = sedf_free_domdata,
-
- .init = sedf_init,
- .deinit = sedf_deinit,
-
- .do_schedule = sedf_do_schedule,
- .pick_cpu = sedf_pick_cpu,
- .dump_cpu_state = sedf_dump_cpu_state,
- .sleep = sedf_sleep,
- .wake = sedf_wake,
- .adjust = sedf_adjust,
-};
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 6/7] xl: get rid of the SEDF scheduler
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
` (4 preceding siblings ...)
2015-06-26 16:19 ` [PATCH 5/7] xen: kill sched_sedf.c Dario Faggioli
@ 2015-06-26 16:19 ` Dario Faggioli
2015-06-26 16:19 ` [PATCH 7/7] docs: " Dario Faggioli
2015-07-02 15:56 ` [PATCH 0/7] " George Dunlap
7 siblings, 0 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:19 UTC (permalink / raw)
To: xen-devel
Cc: George Dunlap, Wei Liu, Ian Jackson, Ian Campbell, Stefano Stabellini
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
---
docs/man/xl.cfg.pod.5 | 24 --------
docs/man/xl.pod.1 | 42 --------------
tools/libxl/xl.h | 1
tools/libxl/xl_cmdimpl.c | 139 ---------------------------------------------
tools/libxl/xl_cmdtable.c | 16 -----
5 files changed, 1 insertion(+), 221 deletions(-)
diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index a3e0e2e..27e7643 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -198,7 +198,7 @@ For more details, see F<docs/misc/xl-numa-placement.markdown>.
A domain with a weight of 512 will get twice as much CPU as a domain
with a weight of 256 on a contended host.
Legal weights range from 1 to 65535 and the default is 256.
-Honoured by the credit, credit2 and sedf schedulers.
+Honoured by the credit and credit2 schedulers.
=item B<cap=N>
@@ -222,28 +222,6 @@ that your VM gets 25% of the available power (50% of 1GHz) rather than
look at performance and cpufreq options in your operating system and
your BIOS.
-=item B<period=NANOSECONDS>
-
-The normal EDF scheduling usage in nanoseconds. This means every period
-the domain gets cpu time defined in slice.
-Honoured by the sedf scheduler.
-
-=item B<slice=NANOSECONDS>
-
-The normal EDF scheduling usage in nanoseconds. it defines the time
-a domain get every period time.
-Honoured by the sedf scheduler.
-
-=item B<latency=N>
-
-Scaled period if domain is doing heavy I/O.
-Honoured by the sedf scheduler.
-
-=item B<extratime=BOOLEAN>
-
-Flag for allowing domain to run in extra time.
-Honoured by the sedf scheduler.
-
=back
=head3 Memory Allocation
diff --git a/docs/man/xl.pod.1 b/docs/man/xl.pod.1
index 4eb929d..7951aff 100644
--- a/docs/man/xl.pod.1
+++ b/docs/man/xl.pod.1
@@ -1031,48 +1031,6 @@ Restrict output to domains in the specified cpupool.
=back
-=item B<sched-sedf> [I<OPTIONS>]
-
-Set or get Simple EDF (Earliest Deadline First) scheduler parameters. This
-scheduler provides weighted CPU sharing in an intuitive way and uses
-realtime-algorithms to ensure time guarantees. For more information see
-docs/misc/sedf_scheduler_mini-HOWTO.txt in the Xen distribution.
-
-B<OPTIONS>
-
-=over 4
-
-=item B<-d DOMAIN>, B<--domain=DOMAIN>
-
-Specify domain for which scheduler parameters are to be modified or retrieved.
-Mandatory for modifying scheduler parameters.
-
-=item B<-p PERIOD>, B<--period=PERIOD>
-
-The normal EDF scheduling usage in milliseconds.
-
-=item B<-s SLICE>, B<--slice=SLICE>
-
-The normal EDF scheduling usage in milliseconds.
-
-=item B<-l LATENCY>, B<--latency=LATENCY>
-
-Scaled period if domain is doing heavy I/O.
-
-=item B<-e EXTRA>, B<--extra=EXTRA>
-
-Flag for allowing domain to run in extra time (0 or 1).
-
-=item B<-w WEIGHT>, B<--weight=WEIGHT>
-
-Another way of setting CPU slice.
-
-=item B<-c CPUPOOL>, B<--cpupool=CPUPOOL>
-
-Restrict output to domains in the specified cpupool.
-
-=back
-
=item B<sched-rtds> [I<OPTIONS>]
Set or get rtds (Real Time Deferrable Server) scheduler parameters.
diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
index 5bc138c..fe44b86 100644
--- a/tools/libxl/xl.h
+++ b/tools/libxl/xl.h
@@ -66,7 +66,6 @@ int main_memmax(int argc, char **argv);
int main_memset(int argc, char **argv);
int main_sched_credit(int argc, char **argv);
int main_sched_credit2(int argc, char **argv);
-int main_sched_sedf(int argc, char **argv);
int main_sched_rtds(int argc, char **argv);
int main_domid(int argc, char **argv);
int main_domname(int argc, char **argv);
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index c858068..de60449 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5725,37 +5725,6 @@ static int sched_credit2_domain_output(
return 0;
}
-static int sched_sedf_domain_output(
- int domid)
-{
- char *domname;
- libxl_domain_sched_params scinfo;
- int rc;
-
- if (domid < 0) {
- printf("%-33s %4s %6s %-6s %7s %5s %6s\n", "Name", "ID", "Period",
- "Slice", "Latency", "Extra", "Weight");
- return 0;
- }
-
- libxl_domain_sched_params_init(&scinfo);
- rc = sched_domain_get(LIBXL_SCHEDULER_SEDF, domid, &scinfo);
- if (rc)
- return rc;
- domname = libxl_domid_to_name(ctx, domid);
- printf("%-33s %4d %6d %6d %7d %5d %6d\n",
- domname,
- domid,
- scinfo.period,
- scinfo.slice,
- scinfo.latency,
- scinfo.extratime,
- scinfo.weight);
- free(domname);
- libxl_domain_sched_params_dispose(&scinfo);
- return 0;
-}
-
static int sched_rtds_domain_output(
int domid)
{
@@ -6056,114 +6025,6 @@ int main_sched_credit2(int argc, char **argv)
return 0;
}
-int main_sched_sedf(int argc, char **argv)
-{
- const char *dom = NULL;
- const char *cpupool = NULL;
- int period = 0, opt_p = 0;
- int slice = 0, opt_s = 0;
- int latency = 0, opt_l = 0;
- int extra = 0, opt_e = 0;
- int weight = 0, opt_w = 0;
- int opt, rc;
- static struct option opts[] = {
- {"period", 1, 0, 'p'},
- {"slice", 1, 0, 's'},
- {"latency", 1, 0, 'l'},
- {"extra", 1, 0, 'e'},
- {"weight", 1, 0, 'w'},
- {"cpupool", 1, 0, 'c'},
- COMMON_LONG_OPTS,
- {0, 0, 0, 0}
- };
-
- SWITCH_FOREACH_OPT(opt, "d:p:s:l:e:w:c:h", opts, "sched-sedf", 0) {
- case 'd':
- dom = optarg;
- break;
- case 'p':
- period = strtol(optarg, NULL, 10);
- opt_p = 1;
- break;
- case 's':
- slice = strtol(optarg, NULL, 10);
- opt_s = 1;
- break;
- case 'l':
- latency = strtol(optarg, NULL, 10);
- opt_l = 1;
- break;
- case 'e':
- extra = strtol(optarg, NULL, 10);
- opt_e = 1;
- break;
- case 'w':
- weight = strtol(optarg, NULL, 10);
- opt_w = 1;
- break;
- case 'c':
- cpupool = optarg;
- break;
- }
-
- if (cpupool && (dom || opt_p || opt_s || opt_l || opt_e || opt_w)) {
- fprintf(stderr, "Specifying a cpupool is not allowed with other "
- "options.\n");
- return 1;
- }
- if (!dom && (opt_p || opt_s || opt_l || opt_e || opt_w)) {
- fprintf(stderr, "Must specify a domain.\n");
- return 1;
- }
- if (opt_w && (opt_p || opt_s)) {
- fprintf(stderr, "Specifying a weight AND period or slice is not "
- "allowed.\n");
- }
-
- if (!dom) { /* list all domain's credit scheduler info */
- return -sched_domain_output(LIBXL_SCHEDULER_SEDF,
- sched_sedf_domain_output,
- sched_default_pool_output,
- cpupool);
- } else {
- uint32_t domid = find_domain(dom);
-
- if (!opt_p && !opt_s && !opt_l && !opt_e && !opt_w) {
- /* output sedf scheduler info */
- sched_sedf_domain_output(-1);
- return -sched_sedf_domain_output(domid);
- } else { /* set sedf scheduler paramaters */
- libxl_domain_sched_params scinfo;
- libxl_domain_sched_params_init(&scinfo);
- scinfo.sched = LIBXL_SCHEDULER_SEDF;
-
- if (opt_p) {
- scinfo.period = period;
- scinfo.weight = 0;
- }
- if (opt_s) {
- scinfo.slice = slice;
- scinfo.weight = 0;
- }
- if (opt_l)
- scinfo.latency = latency;
- if (opt_e)
- scinfo.extratime = extra;
- if (opt_w) {
- scinfo.weight = weight;
- scinfo.period = 0;
- scinfo.slice = 0;
- }
- rc = sched_domain_set(domid, &scinfo);
- libxl_domain_sched_params_dispose(&scinfo);
- if (rc)
- return -rc;
- }
- }
-
- return 0;
-}
-
/*
* <nothing> : List all domain paramters and sched params
* -d [domid] : List domain params for domain
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
index 7f4759b..0a42456 100644
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -265,22 +265,6 @@ struct cmd_spec cmd_table[] = {
"-w WEIGHT, --weight=WEIGHT Weight (int)\n"
"-p CPUPOOL, --cpupool=CPUPOOL Restrict output to CPUPOOL"
},
- { "sched-sedf",
- &main_sched_sedf, 0, 1,
- "Get/set sedf scheduler parameters",
- "[options]",
- "-d DOMAIN, --domain=DOMAIN Domain to modify\n"
- "-p MS, --period=MS Relative deadline(ms)\n"
- "-s MS, --slice=MS Worst-case execution time(ms).\n"
- " (slice < period)\n"
- "-l MS, --latency=MS Scaled period (ms) when domain\n"
- " performs heavy I/O\n"
- "-e FLAG, --extra=FLAG Flag (0 or 1) controls if domain\n"
- " can run in extra time\n"
- "-w FLOAT, --weight=FLOAT CPU Period/slice (do not set with\n"
- " --period/--slice)\n"
- "-c CPUPOOL, --cpupool=CPUPOOL Restrict output to CPUPOOL"
- },
{ "sched-rtds",
&main_sched_rtds, 0, 1,
"Get/set rtds scheduler parameters",
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 7/7] docs: get rid of the SEDF scheduler
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
` (5 preceding siblings ...)
2015-06-26 16:19 ` [PATCH 6/7] xl: get rid of the SEDF scheduler Dario Faggioli
@ 2015-06-26 16:19 ` Dario Faggioli
2015-07-02 15:56 ` [PATCH 0/7] " George Dunlap
7 siblings, 0 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-26 16:19 UTC (permalink / raw)
To: xen-devel
Cc: George Dunlap, Wei Liu, Ian Jackson, Ian Campbell, Stefano Stabellini
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
---
docs/INDEX | 1 -
docs/man/xlcpupool.cfg.pod.5 | 4 ---
docs/misc/sedf_scheduler_mini-HOWTO.txt | 44 -------------------------------
tools/examples/cpupool | 2 +
4 files changed, 1 insertion(+), 50 deletions(-)
delete mode 100644 docs/misc/sedf_scheduler_mini-HOWTO.txt
diff --git a/docs/INDEX b/docs/INDEX
index 5ed156f..7d26cf8 100644
--- a/docs/INDEX
+++ b/docs/INDEX
@@ -20,7 +20,6 @@ misc/xl-disk-configuration XL Disk Configuration
misc/xl-network-configuration XL Network Configuration
misc/distro_mapping Distro Directory Layouts
misc/dump-core-format Xen Core Dump Format
-misc/sedf_scheduler_mini-HOWTO sEDF Mini HOWTO
misc/vtd VT-d HOWTO
misc/vtpm Virtual TPM
misc/xen-error-handling Xen Error Handling
diff --git a/docs/man/xlcpupool.cfg.pod.5 b/docs/man/xlcpupool.cfg.pod.5
index 2ff8ee8..792cf4f 100644
--- a/docs/man/xlcpupool.cfg.pod.5
+++ b/docs/man/xlcpupool.cfg.pod.5
@@ -78,10 +78,6 @@ the credit2 scheduler
the RTDS scheduler
-=item B<sedf>
-
-the SEDF scheduler
-
=back
The default scheduler is the one used for C<Pool-0> specified as
diff --git a/docs/misc/sedf_scheduler_mini-HOWTO.txt b/docs/misc/sedf_scheduler_mini-HOWTO.txt
deleted file mode 100644
index 6742867..0000000
--- a/docs/misc/sedf_scheduler_mini-HOWTO.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-sEDF scheduler
---------------
-Author:
- Stephan.Diestelhorst@{cl.cam.ac.uk, inf.tu-dresden.de}
-
-Overview:
- This scheduler provides weighted CPU sharing in an intuitive way and
- uses realtime-algorithms to ensure time guarantees.
-
-Usage:
- -add "sched=sedf" on Xen's boot command-line
- -create domains as usual
- -use "xm sched-sedf <dom-id> <period> <slice> <latency-hint> <extra> <weight>"
- Where:
- -period/slice are the normal EDF scheduling parameters in nanosecs
- -latency-hint is the scaled period in case the domain is doing heavy I/O
- (unused by the currently compiled version)
- -extra is a flag (0/1), which controls whether the domain can run in
- extra-time
- -weight is mutually exclusive with period/slice and specifies another
- way of setting a domains cpu slice
-
-Examples:
- normal EDF (20ms/5ms):
- xm sched-sedf <dom-id> 20000000 5000000 0 0 0
-
- best-effort domains (i.e. non-realtime):
- xm sched-sedf <dom-id> 20000000 0 0 1 0
-
- normal EDF (20ms/5ms) + share of extra-time:
- xm sched-sedf <dom-id> 20000000 5000000 0 1 0
-
- 4 domains with weights 2:3:4:2
- xm sched-sedf <d1> 0 0 0 0 2
- xm sched-sedf <d2> 0 0 0 0 3
- xm sched-sedf <d3> 0 0 0 0 4
- xm sched-sedf <d4> 0 0 0 0 2
-
- 1 fully-specified (10ms/3ms) domain, 3 other domains share
- available rest in 2:7:3 ratio:
- xm sched-sedf <d1> 10000000 3000000 0 0 0
- xm sched-sedf <d2> 0 0 0 0 2
- xm sched-sedf <d3> 0 0 0 0 7
- xm sched-sedf <d4> 0 0 0 0 3
diff --git a/tools/examples/cpupool b/tools/examples/cpupool
index 73368e6..35e229e 100644
--- a/tools/examples/cpupool
+++ b/tools/examples/cpupool
@@ -9,7 +9,7 @@
# the name of the new cpupool
name = "Example-Cpupool"
-# the scheduler to use: valid are e.g. credit, credit2, rtds and sedf
+# the scheduler to use: valid are e.g. credit, credit2 and rtds
sched = "credit"
# list of cpus to use
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 4/7] xen: get rid of the SEDF scheduler
2015-06-26 16:19 ` [PATCH 4/7] xen: " Dario Faggioli
@ 2015-06-29 11:56 ` Andrew Cooper
2015-06-29 13:29 ` Dario Faggioli
0 siblings, 1 reply; 11+ messages in thread
From: Andrew Cooper @ 2015-06-29 11:56 UTC (permalink / raw)
To: Dario Faggioli, xen-devel; +Cc: George Dunlap
On 26/06/15 17:19, Dario Faggioli wrote:
> --- a/xen/include/public/domctl.h
> +++ b/xen/include/public/domctl.h
> @@ -324,7 +324,6 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_max_vcpus_t);
>
> /* XEN_DOMCTL_scheduler_op */
> /* Scheduler types. */
> -#define XEN_SCHEDULER_SEDF 4
Please instead use:
/* #define XEN_SCHEDULER_SEDF 4 (Removed) */
To help keep bits of the history, and reduce the likelyhood of
accidental reuse.
> #define XEN_SCHEDULER_CREDIT 5
> #define XEN_SCHEDULER_CREDIT2 6
> #define XEN_SCHEDULER_ARINC653 7
> @@ -337,13 +336,6 @@ struct xen_domctl_scheduler_op {
> uint32_t sched_id; /* XEN_SCHEDULER_* */
> uint32_t cmd; /* XEN_DOMCTL_SCHEDOP_* */
> union {
> - struct xen_domctl_sched_sedf {
> - uint64_aligned_t period;
> - uint64_aligned_t slice;
> - uint64_aligned_t latency;
> - uint32_t extratime;
> - uint32_t weight;
> - } sedf;
> struct xen_domctl_sched_credit {
> uint16_t weight;
> uint16_t cap;
> diff --git a/xen/include/public/trace.h b/xen/include/public/trace.h
> index 5211ae7..36be196 100644
> --- a/xen/include/public/trace.h
> +++ b/xen/include/public/trace.h
> @@ -75,7 +75,6 @@
> /* Per-scheduler IDs, to identify scheduler specific events */
> #define TRC_SCHED_CSCHED 0
> #define TRC_SCHED_CSCHED2 1
> -#define TRC_SCHED_SEDF 2
Same here.
~Andrew
> #define TRC_SCHED_ARINC653 3
> #define TRC_SCHED_RTDS 4
>
> diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
> index 7cc25c6..dbe7cab 100644
> --- a/xen/include/xen/sched-if.h
> +++ b/xen/include/xen/sched-if.h
> @@ -165,7 +165,6 @@ struct scheduler {
> void (*tick_resume) (const struct scheduler *, unsigned int);
> };
>
> -extern const struct scheduler sched_sedf_def;
> extern const struct scheduler sched_credit_def;
> extern const struct scheduler sched_credit2_def;
> extern const struct scheduler sched_arinc653_def;
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 4/7] xen: get rid of the SEDF scheduler
2015-06-29 11:56 ` Andrew Cooper
@ 2015-06-29 13:29 ` Dario Faggioli
0 siblings, 0 replies; 11+ messages in thread
From: Dario Faggioli @ 2015-06-29 13:29 UTC (permalink / raw)
To: Andrew Cooper; +Cc: George Dunlap, xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 1005 bytes --]
On Mon, 2015-06-29 at 12:56 +0100, Andrew Cooper wrote:
> On 26/06/15 17:19, Dario Faggioli wrote:
> > --- a/xen/include/public/domctl.h
> > +++ b/xen/include/public/domctl.h
> > @@ -324,7 +324,6 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_max_vcpus_t);
> >
> > /* XEN_DOMCTL_scheduler_op */
> > /* Scheduler types. */
> > -#define XEN_SCHEDULER_SEDF 4
>
> Please instead use:
>
> /* #define XEN_SCHEDULER_SEDF 4 (Removed) */
>
> To help keep bits of the history, and reduce the likelyhood of
> accidental reuse.
>
Ok, good point.
I just killed it as I did not see any trace of 0-3, which I suspect were
the other previously existing schedulers, but, yes, I'll do as you
suggest.
Thanks and Regards,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
[-- Attachment #1.2: This is a digitally signed message part --]
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/7] get rid of the SEDF scheduler
2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
` (6 preceding siblings ...)
2015-06-26 16:19 ` [PATCH 7/7] docs: " Dario Faggioli
@ 2015-07-02 15:56 ` George Dunlap
7 siblings, 0 replies; 11+ messages in thread
From: George Dunlap @ 2015-07-02 15:56 UTC (permalink / raw)
To: Dario Faggioli, xen-devel
Cc: Wei Liu, Ian Jackson, Ian Campbell, Stefano Stabellini
On 06/26/2015 05:18 PM, Dario Faggioli wrote:
> Hi everyone,
>
> This series is the follow up of this proposal and conversation:
> http://lists.xen.org/archives/html/xen-devel/2015-05/msg02874.html
>
> Let me quote this (again), from 2006:
> git show db51cd09d37ea44b126bb259f9392248afd768e6
> ...
> diff --git a/docs/src/interface.tex b/docs/src/interface.tex
> index c9017c7..9a59840 100644
> --- a/docs/src/interface.tex
> +++ b/docs/src/interface.tex
> @@ -209,8 +209,8 @@ implement timeout values when they block.
>
> Xen offers a uniform API for CPU schedulers. It is possible to choose
> from a number of schedulers at boot and it should be easy to add more.
> -The SEDF, BVT, and Credit schedulers are part of the normal Xen
> -distribution. BVT and SEDF will be going away and their use should be
> +The SEDF and Credit schedulers are part of the normal Xen
> +distribution. SEDF will be going away and its use should be
> avoided once the credit scheduler has stabilized and become the default.
> The Credit scheduler provides proportional fair shares of the
> host's CPUs to the running domains. It does this while transparently
>
> So, after being "going away" for 9 years, here we are, getting rid of it!
> Hopefully, I've killed every sign of it, and did not overlook anything.
>
> I'm not sure whether the python bindings are an interface that we consider
> stable. I've killed everything about SEDF from there, but I don't know sure how
> to test this. If I should do it differently, let me know.
>
> In libxl, I left the symbols and the data types in place, for the sake of
> build-time backward compatibility, but any attempt of calling one of the
> scheduler API function with LIBXL_SCHEDULED_SEDF as the scheduler id, results
> in an error.
>
> As far as testing goes, I have verified that:
> - the repo builds, both xen and tools, at each stage of the series
> - booting with sched=sedf no longer works
> - with all the series applied, `xl sched-sedf' no longer exists
> - with the libxl+libxc patches patch applied (so, with SEDF still available in Xen
> and xl), `xl sched-sedf' exists, but produces an error
>
> There is an OSSTest patch that shuts down SEDF testing for xen-unstable
> (actually, for everything greater than xen-4.5) here:
> http://lists.xen.org/archives/html/xen-devel/2015-06/msg04399.html
>
> Regards,
> Dario
> ---
> Dario Faggioli (7):
> libxl: get rid of the SEDF scheduler
> tools: python: get rid of the SEDF scheduler bindings
> libxc: get rid of the SEDF scheduler
> xen: get rid of the SEDF scheduler
> xen: kill sched_sedf.c
> xl: get rid of the SEDF scheduler
> docs: get rid of the SEDF scheduler
The entire series:
Reviewed-by: George Dunlap <george.dunlap@eu.citrix.com>
Good to see it finally go. :-)
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2015-07-02 15:57 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
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2015-06-26 16:18 [PATCH 0/7] get rid of the SEDF scheduler Dario Faggioli
2015-06-26 16:18 ` [PATCH 1/7] libxl: " Dario Faggioli
2015-06-26 16:18 ` [PATCH 2/7] tools: python: get rid of the SEDF scheduler bindings Dario Faggioli
2015-06-26 16:19 ` [PATCH 3/7] libxc: get rid of the SEDF scheduler Dario Faggioli
2015-06-26 16:19 ` [PATCH 4/7] xen: " Dario Faggioli
2015-06-29 11:56 ` Andrew Cooper
2015-06-29 13:29 ` Dario Faggioli
2015-06-26 16:19 ` [PATCH 5/7] xen: kill sched_sedf.c Dario Faggioli
2015-06-26 16:19 ` [PATCH 6/7] xl: get rid of the SEDF scheduler Dario Faggioli
2015-06-26 16:19 ` [PATCH 7/7] docs: " Dario Faggioli
2015-07-02 15:56 ` [PATCH 0/7] " George Dunlap
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