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percpu: fix a comment about the chunks ordering 

Since the commit 3e54097beb ("percpu: manage chunks based on
contig_bits instead of free_bytes") chunks are sorted based on the
size of the biggest continuous free area instead of the total number
of free bytes. Update the corresponding comment to reflect this.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
This commit is contained in:
Roman Gushchin 2021-04-07 20:57:31 -07:00 committed by Dennis Zhou
parent d434405aaa
commit ac9380f6b8
1 changed files with 4 additions and 1 deletions
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5
mm/percpu.c
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@ -99,7 +99,10 @@
#include "percpu-internal.h"
/* the slots are sorted by free bytes left, 1-31 bytes share the same slot */
/*
* The slots are sorted by the size of the biggest continuous free area.
* 1-31 bytes share the same slot.
*/
#define PCPU_SLOT_BASE_SHIFT 5
/* chunks in slots below this are subject to being sidelined on failed alloc */
#define PCPU_SLOT_FAIL_THRESHOLD 3