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SeongJae Park 7d7e02563b mm/damon/core: fix fake load reports due to uninterruptible sleeps

commit 70e9274805fccfd175d0431a947bfd11ee7df40e upstream.

Because DAMON sleeps in uninterruptible mode, /proc/loadavg reports fake
load while DAMON is turned on, though it is doing nothing.  This can
confuse users[1].  To avoid the case, this commit makes DAMON sleeps in
idle mode.

[1] https://lore.kernel.org/all/11868371.O9o76ZdvQC@natalenko.name/

Link: https://lkml.kernel.org/r/20211126145015.15862-3-sj@kernel.org
Fixes: 2224d8485492 ("mm: introduce Data Access MONitor (DAMON)")
Reported-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: SeongJae Park <sj@kernel.org>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2021-12-14 10:57:11 +01:00

core-test.h

mm/damon/core-test: fix wrong expectations for 'damon_split_regions_of()'

2021-10-28 17:18:55 -07:00

core.c

mm/damon/core: fix fake load reports due to uninterruptible sleeps

2021-12-14 10:57:11 +01:00

dbgfs-test.h

mm/damon: don't use strnlen() with known-bogus source length

2021-09-24 16:13:34 -07:00

dbgfs.c

mm/damon/dbgfs: fix missed use of damon_dbgfs_lock