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mm/damon/core: do not call damos_walk_control->walk() if walk is completed

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damos_walk() invokes callback functions of schemes until all schemes
finishes at least one round of walks.  If there are multiple DAMOS schemes
having different apply_interval, the callback functions for longer apply
interval scheme will be called for more than a round of the walk.

The behavior is different from the document (see damos_walk() kernel-doc
comment), and not useful.  Make the behavior be same to the documented
one, by stopping invoking the callback if the walk for the given scheme is
completed.

Link: https://lkml.kernel.org/r/20250210182737.134994-3-sj@kernel.org
Fixes: bf0eaba0ff9c ("mm/damon/core: implement damos_walk()")
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2025-02-10 10:27:35 -08:00 committed by Andrew Morton
parent c32696ca5e
commit 40eb655b41
1 changed files with 3 additions and 0 deletions
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mm/damon/core.c
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@ -1458,6 +1458,9 @@ static void damos_walk_call_walk(struct damon_ctx *ctx, struct damon_target *t,
{
struct damos_walk_control *control;
if (s->walk_completed)
return;
mutex_lock(&ctx->walk_control_lock);
control = ctx->walk_control;
mutex_unlock(&ctx->walk_control_lock);