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memcg: use a folio in get_mctgt_type_thp

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Replace five calls to compound_head() with one.

Link: https://lkml.kernel.org/r/20240111181219.3462852-5-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-01-11 18:12:19 +00:00 committed by Andrew Morton
parent b67fa6e47b
commit f6c7590b4e
1 changed files with 7 additions and 5 deletions
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12
mm/memcontrol.c
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@ -6194,6 +6194,7 @@ static enum mc_target_type get_mctgt_type_thp(struct vm_area_struct *vma,
unsigned long addr, pmd_t pmd, union mc_target *target)
{
struct page *page = NULL;
struct folio *folio;
enum mc_target_type ret = MC_TARGET_NONE;
if (unlikely(is_swap_pmd(pmd))) {
@ -6203,17 +6204,18 @@ static enum mc_target_type get_mctgt_type_thp(struct vm_area_struct *vma,
}
page = pmd_page(pmd);
VM_BUG_ON_PAGE(!page || !PageHead(page), page);
folio = page_folio(page);
if (!(mc.flags & MOVE_ANON))
return ret;
if (page_memcg(page) == mc.from) {
if (folio_memcg(folio) == mc.from) {
ret = MC_TARGET_PAGE;
if (target) {
get_page(page);
if (!trylock_page(page)) {
put_page(page);
folio_get(folio);
if (!folio_trylock(folio)) {
folio_put(folio);
return MC_TARGET_NONE;
}
target->folio = page_folio(page);
target->folio = folio;
}
}
return ret;