diff options
| author | Roman Gushchin <guro@fb.com> | 2021-04-08 05:57:35 +0200 |
|---|---|---|
| committer | Dennis Zhou <dennis@kernel.org> | 2021-04-21 20:17:35 +0200 |
| commit | 8ea2e1e35d1eb4c76290ff5d565a1bfd6c24f117 (patch) | |
| tree | 1d42a0d34cb132f062ace0cc1b5d31214b37e984 /mm/percpu.c | |
| parent | percpu: split __pcpu_balance_workfn() (diff) | |
| download | linux-8ea2e1e35d1eb4c76290ff5d565a1bfd6c24f117.tar.xz linux-8ea2e1e35d1eb4c76290ff5d565a1bfd6c24f117.zip | |
percpu: factor out pcpu_check_block_hint()
Factor out the pcpu_check_block_hint() helper, which will be useful
in the future. The new function checks if the allocation can likely
fit within the contig hint.
Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Diffstat (limited to 'mm/percpu.c')
| -rw-r--r-- | mm/percpu.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index 61339b3d9337..5edc7bd88133 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -306,6 +306,25 @@ static unsigned long pcpu_block_off_to_off(int index, int off) return index * PCPU_BITMAP_BLOCK_BITS + off; } +/** + * pcpu_check_block_hint - check against the contig hint + * @block: block of interest + * @bits: size of allocation + * @align: alignment of area (max PAGE_SIZE) + * + * Check to see if the allocation can fit in the block's contig hint. + * Note, a chunk uses the same hints as a block so this can also check against + * the chunk's contig hint. + */ +static bool pcpu_check_block_hint(struct pcpu_block_md *block, int bits, + size_t align) +{ + int bit_off = ALIGN(block->contig_hint_start, align) - + block->contig_hint_start; + + return bit_off + bits <= block->contig_hint; +} + /* * pcpu_next_hint - determine which hint to use * @block: block of interest @@ -1066,14 +1085,11 @@ static int pcpu_find_block_fit(struct pcpu_chunk *chunk, int alloc_bits, int bit_off, bits, next_off; /* - * Check to see if the allocation can fit in the chunk's contig hint. - * This is an optimization to prevent scanning by assuming if it - * cannot fit in the global hint, there is memory pressure and creating - * a new chunk would happen soon. + * This is an optimization to prevent scanning by assuming if the + * allocation cannot fit in the global hint, there is memory pressure + * and creating a new chunk would happen soon. */ - bit_off = ALIGN(chunk_md->contig_hint_start, align) - - chunk_md->contig_hint_start; - if (bit_off + alloc_bits > chunk_md->contig_hint) + if (!pcpu_check_block_hint(chunk_md, alloc_bits, align)) return -1; bit_off = pcpu_next_hint(chunk_md, alloc_bits); |