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linux 6.7 compat: rework shrinker setup for heap allocations

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6.7 changes the shrinker API such that shrinkers must be allocated
dynamically by the kernel. To accomodate this, this commit reworks
spl_register_shrinker() to do something similar against earlier kernels.

Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://github.com/sponsors/robn
This commit is contained in:
Rob Norris
2023-12-17 00:36:21 +11:00
committed by Brian Behlendorf
parent 18a9185165
commit 03b84099d9
5 changed files with 189 additions and 56 deletions
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module/os/linux/zfs/arc_os.c
+7 -4
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@@ -247,8 +247,7 @@ arc_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
return (sc->nr_to_scan);
}
SPL_SHRINKER_DECLARE(arc_shrinker,
arc_shrinker_count, arc_shrinker_scan, DEFAULT_SEEKS);
static struct shrinker *arc_shrinker = NULL;
int
arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg)
@@ -351,14 +350,18 @@ arc_lowmem_init(void)
* reclaim from the arc. This is done to prevent kswapd from
* swapping out pages when it is preferable to shrink the arc.
*/
spl_register_shrinker(&arc_shrinker);
arc_shrinker = spl_register_shrinker("zfs-arc-shrinker",
arc_shrinker_count, arc_shrinker_scan, DEFAULT_SEEKS);
VERIFY(arc_shrinker);
arc_set_sys_free(allmem);
}
void
arc_lowmem_fini(void)
{
spl_unregister_shrinker(&arc_shrinker);
spl_unregister_shrinker(arc_shrinker);
arc_shrinker = NULL;
}
int