linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Morten Rasmussen <morten.rasmussen@arm.com>
To: peterz@infradead.org, mingo@redhat.com
Cc: dietmar.eggemann@arm.com, yuyang.du@intel.com,
	vincent.guittot@linaro.org, mgalbraith@suse.de,
	linux-kernel@vger.kernel.org,
	Morten Rasmussen <morten.rasmussen@arm.com>
Subject: [PATCH 07/16] sched: Make SD_BALANCE_WAKE a topology flag
Date: Mon, 23 May 2016 11:58:49 +0100	[thread overview]
Message-ID: <1464001138-25063-8-git-send-email-morten.rasmussen@arm.com> (raw)
In-Reply-To: <1464001138-25063-1-git-send-email-morten.rasmussen@arm.com>

For systems with the SD_ASYM_CPUCAPACITY flag set on higher level in the
sched_domain hierarchy we need a way to enable wake-up balancing for the
lower levels as well as we may want to balance tasks that don't fit the
capacity of the previous cpu.

We have the option of introducing a new topology flag to express this
requirement, or let the existing SD_BALANCE_WAKE flag be set by the
architecture as a topology flag. The former means introducing yet
another flag, the latter breaks the current meaning of topology flags.
None of the options are really desirable.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>

Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
---
 kernel/sched/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 558ec4a..8014b4a 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5658,6 +5658,7 @@ static int sd_degenerate(struct sched_domain *sd)
 			 SD_BALANCE_NEWIDLE |
 			 SD_BALANCE_FORK |
 			 SD_BALANCE_EXEC |
+			 SD_BALANCE_WAKE |
 			 SD_SHARE_CPUCAPACITY |
 			 SD_ASYM_CPUCAPACITY |
 			 SD_SHARE_PKG_RESOURCES |
@@ -5690,6 +5691,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
 				SD_BALANCE_NEWIDLE |
 				SD_BALANCE_FORK |
 				SD_BALANCE_EXEC |
+				SD_BALANCE_WAKE |
 				SD_ASYM_CPUCAPACITY |
 				SD_SHARE_CPUCAPACITY |
 				SD_SHARE_PKG_RESOURCES |
@@ -6308,6 +6310,7 @@ static int sched_domains_curr_level;
  * Odd ones out:
  * SD_ASYM_PACKING        - describes SMT quirks
  * SD_ASYM_CPUCAPACITY    - describes mixed capacity topologies
+ * SD_BALANCE_WAKE	  - controls wake-up balancing (expensive)
  */
 #define TOPOLOGY_SD_FLAGS		\
 	(SD_SHARE_CPUCAPACITY |		\
@@ -6315,6 +6318,7 @@ static int sched_domains_curr_level;
 	 SD_NUMA |			\
 	 SD_ASYM_PACKING |		\
 	 SD_ASYM_CPUCAPACITY |		\
+	 SD_BALANCE_WAKE |		\
 	 SD_SHARE_POWERDOMAIN)
 
 static struct sched_domain *
-- 
1.9.1

  parent reply	other threads:[~2016-05-23 11:01 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-23 10:58 [PATCH 00/16] sched: Clean-ups and asymmetric cpu capacity support Morten Rasmussen
2016-05-23 10:58 ` [PATCH 01/16] sched: Fix power to capacity renaming in comment Morten Rasmussen
2016-05-23 10:58 ` [PATCH 02/16] sched/fair: Consistent use of prev_cpu in wakeup path Morten Rasmussen
2016-06-01 19:49   ` Peter Zijlstra
2016-05-23 10:58 ` [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in wake_wide Morten Rasmussen
2016-05-23 11:12   ` Mike Galbraith
2016-05-23 12:00     ` Morten Rasmussen
2016-05-23 13:00       ` Mike Galbraith
2016-05-23 14:10         ` Morten Rasmussen
2016-05-23 15:42           ` Mike Galbraith
2016-05-23 23:17             ` Yuyang Du
2016-05-23 23:04       ` Yuyang Du
2016-06-01 19:57       ` Peter Zijlstra
2016-06-02  8:05         ` Peter Zijlstra
2016-06-07 12:08           ` Morten Rasmussen
2016-05-23 10:58 ` [PATCH 04/16] sched/fair: Optimize find_idlest_cpu() when there is no choice Morten Rasmussen
2016-05-24  6:29   ` Mike Galbraith
2016-05-24  8:05     ` Morten Rasmussen
2016-05-24  8:12       ` Mike Galbraith
2016-06-01 19:59   ` Peter Zijlstra
2016-06-07 14:25     ` Morten Rasmussen
2016-05-23 10:58 ` [PATCH 05/16] sched: Introduce SD_ASYM_CPUCAPACITY sched_domain topology flag Morten Rasmussen
2016-05-23 10:58 ` [PATCH 06/16] sched: Disable WAKE_AFFINE for asymmetric configurations Morten Rasmussen
2016-05-24  9:10   ` Vincent Guittot
2016-05-24 10:29     ` Morten Rasmussen
2016-05-24 12:12       ` Vincent Guittot
2016-05-24 13:16         ` Morten Rasmussen
2016-05-24 13:27           ` Vincent Guittot
2016-05-24 13:36             ` Morten Rasmussen
2016-05-24 13:52               ` Vincent Guittot
2016-05-24 15:02                 ` Morten Rasmussen
2016-05-24 15:53                   ` Vincent Guittot
2016-05-25  9:12                     ` Morten Rasmussen
2016-05-26  6:45                       ` Vincent Guittot
2016-06-07 16:50                         ` Morten Rasmussen
2016-05-23 10:58 ` Morten Rasmussen [this message]
2016-05-24 23:52   ` [PATCH 07/16] sched: Make SD_BALANCE_WAKE a topology flag Yuyang Du
2016-05-25  9:27     ` Morten Rasmussen
2016-06-01 20:18   ` Peter Zijlstra
2016-06-08  8:45     ` Morten Rasmussen
2016-05-23 10:58 ` [PATCH 08/16] sched: Store maximum per-cpu capacity in root domain Morten Rasmussen
2016-05-23 10:58 ` [PATCH 09/16] sched/fair: Let asymmetric cpu configurations balance at wake-up Morten Rasmussen
2016-05-24  0:04   ` Yuyang Du
2016-05-24  8:10     ` Morten Rasmussen
2016-05-24  7:03   ` Mike Galbraith
2016-05-24  7:15     ` Mike Galbraith
2016-05-25  6:57   ` Wanpeng Li
2016-05-25  9:49     ` Morten Rasmussen
2016-05-25 10:29       ` Wanpeng Li
2016-05-25 10:54         ` Morten Rasmussen
2016-05-25 11:18           ` Wanpeng Li
2016-06-02 14:21   ` Peter Zijlstra
2016-06-08 11:29     ` Morten Rasmussen
2016-06-08 14:36       ` Peter Zijlstra
2016-05-23 10:58 ` [PATCH 10/16] sched/fair: Compute task/cpu utilization at wake-up more correctly Morten Rasmussen
2016-05-23 10:58 ` [PATCH 11/16] sched/fair: Consider spare capacity in find_idlest_group() Morten Rasmussen
2016-05-23 10:58 ` [PATCH 12/16] sched: Add per-cpu max capacity to sched_group_capacity Morten Rasmussen
2016-05-23 10:58 ` [PATCH 13/16] sched/fair: Avoid pulling tasks from non-overloaded higher capacity groups Morten Rasmussen
2016-05-23 10:58 ` [PATCH 14/16] arm: Set SD_ASYM_CPUCAPACITY for big.LITTLE platforms Morten Rasmussen
2016-05-23 10:58 ` [PATCH 15/16] arm: Set SD_BALANCE_WAKE flag for asymmetric capacity systems Morten Rasmussen
2016-05-23 10:58 ` [PATCH 16/16] arm: Update arch_scale_cpu_capacity() to reflect change to define Morten Rasmussen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1464001138-25063-8-git-send-email-morten.rasmussen@arm.com \
    --to=morten.rasmussen@arm.com \
    --cc=dietmar.eggemann@arm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mgalbraith@suse.de \
    --cc=mingo@redhat.com \
    --cc=peterz@infradead.org \
    --cc=vincent.guittot@linaro.org \
    --cc=yuyang.du@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).