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authorRoman Gushchin <guro@fb.com>2021-04-07 20:57:33 -0700
committerDennis Zhou <dennis@kernel.org>2021-04-09 13:58:38 +0000
commit0760fa3d8f7fceeea508b98899f1c826e10ffe78 (patch)
treef4fffe3b9d2e2c9c6bcf7b64efed634f8e300d61 /mm
parente49d033bddf5b565044e2abe4241353959bc9120 (diff)
downloadlinux-0760fa3d8f7fceeea508b98899f1c826e10ffe78.tar.bz2
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')
-rw-r--r--mm/percpu-internal.h2
-rw-r--r--mm/percpu-stats.c9
-rw-r--r--mm/percpu.c14
3 files changed, 15 insertions, 10 deletions
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index 18b768ac7dca..095d7eaa0db4 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -87,7 +87,7 @@ extern spinlock_t pcpu_lock;
extern struct list_head *pcpu_chunk_lists;
extern int pcpu_nr_slots;
-extern int pcpu_nr_empty_pop_pages;
+extern int pcpu_nr_empty_pop_pages[];
extern struct pcpu_chunk *pcpu_first_chunk;
extern struct pcpu_chunk *pcpu_reserved_chunk;
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
diff --git a/mm/percpu.c b/mm/percpu.c
index 6596a0a4286e..23308113a5ff 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -173,10 +173,10 @@ struct list_head *pcpu_chunk_lists __ro_after_init; /* chunk list slots */
static LIST_HEAD(pcpu_map_extend_chunks);
/*
- * The number of empty populated pages, protected by pcpu_lock. The
- * reserved chunk doesn't contribute to the count.
+ * The number of empty populated pages by chunk type, protected by pcpu_lock.
+ * The reserved chunk doesn't contribute to the count.
*/
-int pcpu_nr_empty_pop_pages;
+int pcpu_nr_empty_pop_pages[PCPU_NR_CHUNK_TYPES];
/*
* The number of populated pages in use by the allocator, protected by
@@ -556,7 +556,7 @@ static inline void pcpu_update_empty_pages(struct pcpu_chunk *chunk, int nr)
{
chunk->nr_empty_pop_pages += nr;
if (chunk != pcpu_reserved_chunk)
- pcpu_nr_empty_pop_pages += nr;
+ pcpu_nr_empty_pop_pages[pcpu_chunk_type(chunk)] += nr;
}
/*
@@ -1832,7 +1832,7 @@ area_found:
mutex_unlock(&pcpu_alloc_mutex);
}
- if (pcpu_nr_empty_pop_pages < PCPU_EMPTY_POP_PAGES_LOW)
+ if (pcpu_nr_empty_pop_pages[type] < PCPU_EMPTY_POP_PAGES_LOW)
pcpu_schedule_balance_work();
/* clear the areas and return address relative to base address */
@@ -2000,7 +2000,7 @@ retry_pop:
pcpu_atomic_alloc_failed = false;
} else {
nr_to_pop = clamp(PCPU_EMPTY_POP_PAGES_HIGH -
- pcpu_nr_empty_pop_pages,
+ pcpu_nr_empty_pop_pages[type],
0, PCPU_EMPTY_POP_PAGES_HIGH);
}
@@ -2580,7 +2580,7 @@ void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
/* link the first chunk in */
pcpu_first_chunk = chunk;
- pcpu_nr_empty_pop_pages = pcpu_first_chunk->nr_empty_pop_pages;
+ pcpu_nr_empty_pop_pages[PCPU_CHUNK_ROOT] = pcpu_first_chunk->nr_empty_pop_pages;
pcpu_chunk_relocate(pcpu_first_chunk, -1);
/* include all regions of the first chunk */