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mm/swap: optimise lru_add_drain_cpu()

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Do the per-cpu dereferencing of the fbatches once which saves 14 bytes
of text and several percpu relocations.

Link: https://lkml.kernel.org/r/20220617175020.717127-12-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-06-17 18:50:09 +01:00 committed by akpm
parent 4864545a46
commit a2d33b5dd6
1 changed files with 5 additions and 4 deletions
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9
mm/swap.c
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@ -620,7 +620,8 @@ static void lru_lazyfree_fn(struct lruvec *lruvec, struct folio *folio)
*/
void lru_add_drain_cpu(int cpu)
{
struct folio_batch *fbatch = &per_cpu(cpu_fbatches.lru_add, cpu);
struct cpu_fbatches *fbatches = &per_cpu(cpu_fbatches, cpu);
struct folio_batch *fbatch = &fbatches->lru_add;
if (folio_batch_count(fbatch))
folio_batch_move_lru(fbatch, lru_add_fn);
@ -636,15 +637,15 @@ void lru_add_drain_cpu(int cpu)
local_unlock_irqrestore(&lru_rotate.lock, flags);
}
fbatch = &per_cpu(cpu_fbatches.lru_deactivate_file, cpu);
fbatch = &fbatches->lru_deactivate_file;
if (folio_batch_count(fbatch))
folio_batch_move_lru(fbatch, lru_deactivate_file_fn);
fbatch = &per_cpu(cpu_fbatches.lru_deactivate, cpu);
fbatch = &fbatches->lru_deactivate;
if (folio_batch_count(fbatch))
folio_batch_move_lru(fbatch, lru_deactivate_fn);
fbatch = &per_cpu(cpu_fbatches.lru_lazyfree, cpu);
fbatch = &fbatches->lru_lazyfree;
if (folio_batch_count(fbatch))
folio_batch_move_lru(fbatch, lru_lazyfree_fn);