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

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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: 2224d84854 ("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>
This commit is contained in:
SeongJae Park
2021-12-10 14:46:25 -08:00
committed by Greg Kroah-Hartman
parent 5a960e533c
commit 7d7e02563b
1 changed files with 11 additions and 3 deletions
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14
mm/damon/core.c
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@@ -357,6 +357,15 @@ int damon_start(struct damon_ctx **ctxs, int nr_ctxs)
return err;
}
static void kdamond_usleep(unsigned long usecs)
{
/* See Documentation/timers/timers-howto.rst for the thresholds */
if (usecs > 20 * 1000)
schedule_timeout_idle(usecs_to_jiffies(usecs));
else
usleep_idle_range(usecs, usecs + 1);
}
/*
* __damon_stop() - Stops monitoring of given context.
* @ctx: monitoring context
@@ -370,8 +379,7 @@ static int __damon_stop(struct damon_ctx *ctx)
ctx->kdamond_stop = true;
mutex_unlock(&ctx->kdamond_lock);
while (damon_kdamond_running(ctx))
usleep_range(ctx->sample_interval,
ctx->sample_interval * 2);
kdamond_usleep(ctx->sample_interval);
return 0;
}
mutex_unlock(&ctx->kdamond_lock);
@@ -670,7 +678,7 @@ static int kdamond_fn(void *data)
ctx->callback.after_sampling(ctx))
set_kdamond_stop(ctx);
usleep_range(ctx->sample_interval, ctx->sample_interval + 1);
kdamond_usleep(ctx->sample_interval);
if (ctx->primitive.check_accesses)
max_nr_accesses = ctx->primitive.check_accesses(ctx);