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mm/compaction: improve comment of is_via_compact_memory 

JIRA: https://issues.redhat.com/browse/RHEL-27745

This patch is a backport of the following upstream commit:
commit 9cc17ede5125933ab47f8f359c2cce3aca8ee757
Author: Kemeng Shi <shikemeng@huaweicloud.com>
Date:   Fri Sep 1 23:51:40 2023 +0800

    mm/compaction: improve comment of is_via_compact_memory

    We do proactive compaction with order == -1 via
    1. /proc/sys/vm/compact_memory
    2. /sys/devices/system/node/nodex/compact
    3. /proc/sys/vm/compaction_proactiveness
    Add missed situation in which order == -1.

    Link: https://lkml.kernel.org/r/20230901155141.249860-6-shikemeng@huaweicloud.com
    Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
    Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
    Acked-by: Mel Gorman <mgorman@techsingularity.net>
    Cc: David Hildenbrand <david@redhat.com>
    Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Rafael Aquini <raquini@redhat.com>
This commit is contained in:
Rafael Aquini 2024-12-09 12:16:26 -05:00
parent 2487ddb148
commit aec7fb84d2
1 changed files with 4 additions and 2 deletions
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6
mm/compaction.c
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@ -2084,8 +2084,10 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
}
/*
* order == -1 is expected when compacting via
* /proc/sys/vm/compact_memory
* order == -1 is expected when compacting proactively via
* 1. /proc/sys/vm/compact_memory
* 2. /sys/devices/system/node/nodex/compact
* 3. /proc/sys/vm/compaction_proactiveness
*/
static inline bool is_via_compact_memory(int order)
{