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pull_task(), the original function to move the task from src_rq to the
dst_rq during load balancing was renamed to move_tasks() in commit
ddcdf6e7d991 ("sched: Rename load-balancing fields")
As a part of commit 163122b7fcfa ("sched/fair: Remove
double_lock_balance() from load_balance()"), move_task() was broken down
into detach_tasks() and attach_tasks() pair to avoid holding locks of
both src_rq and dst_rq at the same time during load balancing.
Despite the evolution of pull_task() over the years, the sched-stats
documentation remained unchanged. Update the documentation to refer to
detach_task() instead of pull_task() which is responsible for removing
the task from the src_rq during load balancing.
commit 1c055a0f5d3b ("sched: Move sched domain name out of
CONFIG_SCHED_DEBUG") moves sched domain name out of CONFIG_SCHED_DEBUG.
Update the documentation related to that.
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Suggested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Swapnil Sapkal <swapnil.sapkal@amd.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250430062559.1188661-1-swapnil.sapkal@amd.com
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Fixes a typo in the description of the 23rd field of the scheduling
domain statistics, which was missing the word "cpu".
Fixes: 7c8cd569ff66 ("docs: Update Schedstat version to 17")
Signed-off-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250520100752.39921-1-vineethr@linux.ibm.com>
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documentation
Since it's enabled unconditionally now, remove all references to it.
(Left out languages I cannot read.)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250317104257.3496611-5-mingo@kernel.org
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Update the Schedstat version to 17 as more fields are added to report
different kinds of imbalances in the sched domain. Also domain field
started printing corresponding domain name.
Signed-off-by: Swapnil Sapkal <swapnil.sapkal@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20241220063224.17767-7-swapnil.sapkal@amd.com
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Standardize scheduler load-balancing function names on the
sched_balance_() prefix.
Also load_balance() has become somewhat of a misnomer: historically
it was the first and primary load-balancing function that was called,
but with the introduction of sched domains, it's become a lower
layer function that balances runqueues.
Rename it to sched_balance_rq() accordingly.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Link: https://lore.kernel.org/r/20240308111819.1101550-6-mingo@kernel.org
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We changed the order of definitions within 'enum cpu_idle_type',
which changed the order of [CPU_MAX_IDLE_TYPES] columns in
show_schedstat().
Suggested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: "Gautham R. Shenoy" <gautham.shenoy@amd.com>
Link: https://lore.kernel.org/r/20240308105901.1096078-5-mingo@kernel.org
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The unit mentioned in the documentation of scheduler statistics is
outdated which may mislead the readers.
The unit of statistics that is reported by /proc/schedstat is modified
to nanosecond, and the unit of statistics that is reported by
/proc/PID/schedstat is provided as well to make the context consistent.
The rq_cpu_time and the rq_sched_info.run_delay of a run queue, and the
sched_info.run_delay of a task are all updated based on the clock of the
run queue, while the se.sum_exec_runtime of a task is updated based on
the clock_task of the run queue of the task. Both the clock and
clock_task are relied on the return value of the function sched_clock()
which is in the unit of nanosecond.
Signed-off-by: Jui-Tse Huang <juitse.huang@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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In the current implementation, cpu_time and rq_time should be
in nanoseconds, so this document needs to be modified.
Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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The rain.com domain recently moved to pdxhosts.com, making the scheduler
documentation point to broken links. Fix the links in the scheduler
documentation.
CC: Rick Lindsley <ricklind@linux.vnet.ibm.com>
Signed-off-by: Andre Azevedo <andre.azevedo@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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In order to prepare to add them to the Kernel API book,
convert the files to ReST format.
The conversion is actually:
- add blank lines and identation in order to identify paragraphs;
- fix tables markups;
- add some lists markups;
- mark literal blocks;
- adjust title markups.
At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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