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>

...

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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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mm/damon/core.c

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