sched/vtime: Bring up complete kcpustat accessor

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Many callsites want to fetch the values of system, user, user_nice, guest
or guest_nice kcpustat fields altogether or at least a pair of these.

In that case calling kcpustat_field() for each requested field brings
unecessary overhead when we could fetch all of them in a row.

So provide kcpustat_cpu_fetch() that fetches the whole kcpustat array
in a vtime safe way under the same RCU and seqcount block.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Link: https://lkml.kernel.org/r/20191121024430.19938-3-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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This commit is contained in:

Frederic Weisbecker 2019-11-21 03:44:26 +01:00 • committed by Ingo Molnar

parent 5a1c95580f

commit 74722bb223

2 changed files with 123 additions and 20 deletions

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7

include/linux/kernel_stat.h

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136

kernel/sched/cputime.c

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