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mm: vmalloc: add a shrinker to drain vmap pools

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The added shrinker is used to return back current cached VAs into a global
vmap space, when a system enters into a low memory mode.

Link: https://lkml.kernel.org/r/20240102184633.748113-12-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Kazuhito Hagio <k-hagio-ab@nec.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uladzislau Rezki (Sony) 2024-01-02 19:46:33 +01:00 • committed by Andrew Morton
parent 8f33a2ff30
commit 7679ba6b36
1 changed files with 39 additions and 0 deletions
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39
mm/vmalloc.c
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@ -4917,8 +4917,37 @@ static void vmap_init_nodes(void)
}
}
static unsigned long
vmap_node_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
{
unsigned long count;
struct vmap_node *vn;
int i, j;
for (count = 0, i = 0; i < nr_vmap_nodes; i++) {
vn = &vmap_nodes[i];
for (j = 0; j < MAX_VA_SIZE_PAGES; j++)
count += READ_ONCE(vn->pool[j].len);
}
return count ? count : SHRINK_EMPTY;
}
static unsigned long
vmap_node_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
{
int i;
for (i = 0; i < nr_vmap_nodes; i++)
decay_va_pool_node(&vmap_nodes[i], true);
return SHRINK_STOP;
}
void __init vmalloc_init(void)
{
struct shrinker *vmap_node_shrinker;
struct vmap_area *va;
struct vmap_node *vn;
struct vm_struct *tmp;
@ -4966,4 +4995,14 @@ void __init vmalloc_init(void)
*/
vmap_init_free_space();
vmap_initialized = true;
vmap_node_shrinker = shrinker_alloc(0, "vmap-node");
if (!vmap_node_shrinker) {
pr_err("Failed to allocate vmap-node shrinker!\n");
return;
}
vmap_node_shrinker->count_objects = vmap_node_shrink_count;
vmap_node_shrinker->scan_objects = vmap_node_shrink_scan;
shrinker_register(vmap_node_shrinker);
}