| commit | 0760fa3d8f7fceeea508b98899f1c826e10ffe78 | [log] [tgz] |
|---|---|---|
| author | Roman Gushchin <guro@fb.com> | Wed Apr 07 20:57:33 2021 -0700 |
| committer | Dennis Zhou <dennis@kernel.org> | Fri Apr 09 13:58:38 2021 +0000 |
| tree | f4fffe3b9d2e2c9c6bcf7b64efed634f8e300d61 | |
| parent | e49d033bddf5b565044e2abe4241353959bc9120 [diff] |
percpu: make pcpu_nr_empty_pop_pages per chunk type nr_empty_pop_pages is used to guarantee that there are some free populated pages to satisfy atomic allocations. Accounted and non-accounted allocations are using separate sets of chunks, so both need to have a surplus of empty pages. This commit makes pcpu_nr_empty_pop_pages and the corresponding logic per chunk type. [Dennis] This issue came up as I was reviewing [1] and realized I missed this. Simultaneously, it was reported btrfs was seeing failed atomic allocations in fsstress tests [2] and [3]. [1] https://lore.kernel.org/linux-mm/20210324190626.564297-1-guro@fb.com/ [2] https://lore.kernel.org/linux-mm/20210401185158.3275.409509F4@e16-tech.com/ [3] https://lore.kernel.org/linux-mm/CAL3q7H5RNBjCi708GH7jnczAOe0BLnacT9C+OBgA-Dx9jhB6SQ@mail.gmail.com/ Fixes: 3c7be18ac9a0 ("mm: memcg/percpu: account percpu memory to memory cgroups") Cc: stable@vger.kernel.org # 5.9+ Signed-off-by: Roman Gushchin <guro@fb.com> Tested-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Dennis Zhou <dennis@kernel.org>