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authorBaolin Wang <baolin.wang@linux.alibaba.com>2024-02-06 11:08:11 +0800
committerAndrew Morton <akpm@linux-foundation.org>2024-02-22 10:24:55 -0800
commit831bc31a5e82dc189040111fa2ab2f81b8521a9b (patch)
tree9e2a181ecda5b6c804feb3c6c3d9d26b40d018ca /mm/damon
parent055267feaecc9c6c53f128aa50746f64c4ef5ca2 (diff)
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mm: hugetlb: improve the handling of hugetlb allocation failure for freed or in-use hugetlb
alloc_and_dissolve_hugetlb_folio() preallocates a new hugetlb page before it takes hugetlb_lock. In 3 out of 4 cases the page is not really used and therefore the newly allocated page is just freed right away. This is wasteful and it might cause pre-mature failures in those cases. Address that by moving the allocation down to the only case (hugetlb page is really in the free pages pool). We need to drop hugetlb_lock to do so and therefore need to recheck the page state after regaining it. The patch is more of a cleanup than an actual fix to an existing problem. There are no known reports about pre-mature failures. Link: https://lkml.kernel.org/r/62890fd60b1ecd5bf1cdc476c973f60fe37aa0cb.1707181934.git.baolin.wang@linux.alibaba.com Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Muchun Song <muchun.song@linux.dev> Cc: David Hildenbrand <david@redhat.com> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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