io_uring/sqpoll: switch away from getrusage() for CPU accounting

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commit 8ac9b0d33e upstream.

getrusage() does a lot more than what the SQPOLL accounting needs, the
latter only cares about (and uses) the stime. Rather than do a full
RUSAGE_SELF summation, just query the used stime instead.

Cc: stable@vger.kernel.org
Fixes: 3fcb9d1720 ("io_uring/sqpoll: statistics of the true utilization of sq threads")
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jens Axboe 2025-10-21 07:16:08 -06:00 • committed by Greg Kroah-Hartman

parent 6dc769665a

commit 09e5505894

3 changed files with 23 additions and 18 deletions

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8

io_uring/fdinfo.c

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32

io_uring/sqpoll.c

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1

io_uring/sqpoll.h

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