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Message-ID: <20240514044445.1409976-1-swapnil.sapkal@amd.com>
Date: Tue, 14 May 2024 04:44:44 +0000
From: Swapnil Sapkal <swapnil.sapkal@....com>
To: <linux-kernel@...r.kernel.org>, <mingo@...hat.com>, <peterz@...radead.org>
CC: <torvalds@...ux-foundation.org>, <juri.lelli@...hat.com>,
<dietmar.eggemann@....com>, <rostedt@...dmis.org>, <mgorman@...e.de>,
<bristot@...hat.com>, <vschneid@...hat.com>, <vincent.guittot@...aro.org>,
<gautham.shenoy@....com>, <sshegde@...ux.ibm.com>, <kprateek.nayak@....com>,
Swapnil Sapkal <swapnil.sapkal@....com>
Subject: [RESEND][PATCH v3 0/1] Fix lb_imbalance reporting in /proc/schedstat
This patch adds new fields to /proc/schdstat. First version of
the patch is sent here [1]. This patch goes on top of the
commit d72cf62438d6 ("sched/balancing: Fix a couple of outdated function names in comments")
from tip/sched/core. This change is intended to be a part of v16 of
/proc/schedstat.
v2 --> v3 change:
- Incorporated review comment by Shrikanth Hegde
- Added reviewed by.
v1 --> v2 change:
- Added links to previous schedstat documentation
- Incorporated review comments by Shrikanth Hegde
Motivation:
In /proc/schedstat, lb_imbalance reports the sum of imbalances
discovered in sched domains with each call to sched_balance_rq(), which is
not very useful because lb_imbalance does not mention whether the imbalance
is due to load, utilization, nr_tasks or misfit_tasks. Remove this field
from /proc/schedstat.
Currently there is no field in /proc/schedstat to report different types
of imbalances. Introduce new fields in /proc/schedstat to report the
total imbalances in load, utilization, nr_tasks or misfit_tasks.
[1] https://lore.kernel.org/lkml/66f1e42c-9035-4f9b-8c77-976ab50638bd@amd.com/
Swapnil Sapkal (1):
sched: Report the different kinds of imbalances in /proc/schedstat
Documentation/scheduler/sched-stats.rst | 121 ++++++++++++++----------
include/linux/sched/topology.h | 5 +-
kernel/sched/fair.c | 21 +++-
kernel/sched/stats.c | 7 +-
4 files changed, 99 insertions(+), 55 deletions(-)
--
2.34.1
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