* [PATCH lttng-modules] RFC: Always build vmscan probe
@ 2017-04-10 19:03 Michael Jeanson
0 siblings, 0 replies; 2+ messages in thread
From: Michael Jeanson @ 2017-04-10 19:03 UTC (permalink / raw)
To: lttng-dev
The mm/vmscan.c compile unit is a obj-y, even on an old 2.6.36 kernel,
always build the vmscan probe regardless of kernel configuration.
Closes: #143
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
---
probes/Kbuild | 10 +---------
1 file changed, 1 insertion(+), 9 deletions(-)
diff --git a/probes/Kbuild b/probes/Kbuild
index 2afb6dd..bf14c75 100644
--- a/probes/Kbuild
+++ b/probes/Kbuild
@@ -143,19 +143,11 @@ ifneq ($(CONFIG_SCSI),)
echo "lttng-probe-scsi.o" ; fi;)
endif # CONFIG_SCSI
-vmscan = $(shell \
+obj-$(CONFIG_LTTNG) += $(shell \
if [ $(VERSION) -ge 3 \
-o \( $(VERSION) -eq 2 -a $(PATCHLEVEL) -eq 6 -a $(SUBLEVEL) -ge 36 \) ] ; then \
echo "lttng-probe-vmscan.o" ; fi;)
-ifneq ($(CONFIG_SWAP),)
- obj-$(CONFIG_LTTNG) += $(vmscan)
-else
- ifneq ($(CONFIG_CGROUP_MEM_RES_CTLR),)
- obj-$(CONFIG_LTTNG) += $(vmscan)
- endif # CONFIG_CGROUP_MEM_RES_CTLR
-endif # CONFIG_SWAP
-
# lock probe does not work, so disabling it for now
#ifneq ($(CONFIG_LOCKDEP),)
# obj-$(CONFIG_LTTNG) += lttng-probe-lock.o
--
2.7.4
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH lttng-modules] RFC: Always build vmscan probe
[not found] <1491850983-2984-1-git-send-email-mjeanson@efficios.com>
@ 2017-04-19 15:52 ` Jonathan Rajotte Julien
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Rajotte Julien @ 2017-04-19 15:52 UTC (permalink / raw)
To: Michael Jeanson, lttng-dev
Hi,
On 2017-04-10 03:03 PM, Michael Jeanson wrote:
> The mm/vmscan.c compile unit is a obj-y, even on an old 2.6.36 kernel,
> always build the vmscan probe regardless of kernel configuration.
>
> Closes: #143
Probably the incorrect number since the #143 of bugs.lttng.org point to an internal project issue that date back to 5 years ago.
>
I tested build and runtime on a 4.4.14 kernel with !CONFIG_SWAP & !CONFIG_MEMCG. Everything seems fine, events get hits correctly on a memory stress with "stress" with 90% memory usage scenario.
Tested-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
> Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
> ---
> probes/Kbuild | 10 +---------
> 1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/probes/Kbuild b/probes/Kbuild
> index 2afb6dd..bf14c75 100644
> --- a/probes/Kbuild
> +++ b/probes/Kbuild
> @@ -143,19 +143,11 @@ ifneq ($(CONFIG_SCSI),)
> echo "lttng-probe-scsi.o" ; fi;)
> endif # CONFIG_SCSI
>
> -vmscan = $(shell \
> +obj-$(CONFIG_LTTNG) += $(shell \
> if [ $(VERSION) -ge 3 \
> -o \( $(VERSION) -eq 2 -a $(PATCHLEVEL) -eq 6 -a $(SUBLEVEL) -ge 36 \) ] ; then \
> echo "lttng-probe-vmscan.o" ; fi;)
We might want to move this closer to similar statements (e.g. closer to lttng-probe-signal.o).
Cheers
>
> -ifneq ($(CONFIG_SWAP),)
> - obj-$(CONFIG_LTTNG) += $(vmscan)
> -else
> - ifneq ($(CONFIG_CGROUP_MEM_RES_CTLR),)
> - obj-$(CONFIG_LTTNG) += $(vmscan)
> - endif # CONFIG_CGROUP_MEM_RES_CTLR
> -endif # CONFIG_SWAP
> -
> # lock probe does not work, so disabling it for now
> #ifneq ($(CONFIG_LOCKDEP),)
> # obj-$(CONFIG_LTTNG) += lttng-probe-lock.o
>
--
Jonathan R. Julien
Efficios
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lttng-dev@lists.lttng.org
https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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2017-04-10 19:03 [PATCH lttng-modules] RFC: Always build vmscan probe Michael Jeanson
[not found] <1491850983-2984-1-git-send-email-mjeanson@efficios.com>
2017-04-19 15:52 ` Jonathan Rajotte Julien
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