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| author | Roman Gushchin <guro@fb.com> | 2021-04-07 20:57:33 -0700 |
|---|---|---|
| committer | Dennis Zhou <dennis@kernel.org> | 2021-04-09 13:58:38 +0000 |
| commit | 0760fa3d8f7fceeea508b98899f1c826e10ffe78 (patch) | |
| tree | f4fffe3b9d2e2c9c6bcf7b64efed634f8e300d61 /mm/percpu-stats.c | |
| parent | e49d033bddf5b565044e2abe4241353959bc9120 (diff) | |
| download | linux-stable-0760fa3d8f7fceeea508b98899f1c826e10ffe78.tar.gz linux-stable-0760fa3d8f7fceeea508b98899f1c826e10ffe78.tar.bz2 linux-stable-0760fa3d8f7fceeea508b98899f1c826e10ffe78.zip | |
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>
Diffstat (limited to 'mm/percpu-stats.c')
| -rw-r--r-- | mm/percpu-stats.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/percpu-stats.c b/mm/percpu-stats.c index c8400a2adbc2..f6026dbcdf6b 100644 --- a/mm/percpu-stats.c +++ b/mm/percpu-stats.c @@ -145,6 +145,7 @@ static int percpu_stats_show(struct seq_file *m, void *v) int slot, max_nr_alloc; int *buffer; enum pcpu_chunk_type type; + int nr_empty_pop_pages; alloc_buffer: spin_lock_irq(&pcpu_lock); @@ -165,7 +166,11 @@ alloc_buffer: goto alloc_buffer; } -#define PL(X) \ + nr_empty_pop_pages = 0; + for (type = 0; type < PCPU_NR_CHUNK_TYPES; type++) + nr_empty_pop_pages += pcpu_nr_empty_pop_pages[type]; + +#define PL(X) \ seq_printf(m, " %-20s: %12lld\n", #X, (long long int)pcpu_stats_ai.X) seq_printf(m, @@ -196,7 +201,7 @@ alloc_buffer: PU(nr_max_chunks); PU(min_alloc_size); PU(max_alloc_size); - P("empty_pop_pages", pcpu_nr_empty_pop_pages); + P("empty_pop_pages", nr_empty_pop_pages); seq_putc(m, '\n'); #undef PU |