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mm/damon/core: reduce kernel stack usage

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The main thread function has recently grown to the point of exceeding
stack frame size warning limits in some configurations.  This is what I
hit on s390 with clang and CONFIG_KASAN:

mm/damon/core.c:3440:31: error: stack frame size (1352) exceeds limit (1280) in 'kdamond_fn' [-Werror,-Wframe-larger-than]
 3440 | static int kdamond_fn(struct damon_ctx *ctx)

The largest stack usage here is inside of the kdamond_tune_intervals(), so
by marking that one as noinline_for_stack, the functions individually stay
below the warning limit, though kdamond_fn() itself still uses hundreds of
kilobytes for some reason.

Link: https://lore.kernel.org/20260611125704.3386176-1-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Quanmin Yan <yanquanmin1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Arnd Bergmann
2026-06-11 14:56:57 +02:00
committed by Andrew Morton
parent 3c77682d80
commit 5a00cae64d
1 changed files with 1 additions and 1 deletions
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2
mm/damon/core.c
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@@ -2052,7 +2052,7 @@ static unsigned long damon_get_intervals_adaptation_bp(struct damon_ctx *c)
return adaptation_bp;
}
static void kdamond_tune_intervals(struct damon_ctx *c)
static noinline_for_stack void kdamond_tune_intervals(struct damon_ctx *c)
{
unsigned long adaptation_bp;
struct damon_attrs new_attrs;