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mm: restore zone->all_unreclaimable to independence word

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commit e815af95 ("change all_unreclaimable zone member to flags") changed
all_unreclaimable member to bit flag.  But it had an undesireble side
effect.  free_one_page() is one of most hot path in linux kernel and
increasing atomic ops in it can reduce kernel performance a bit.

Thus, this patch revert such commit partially. at least
all_unreclaimable shouldn't share memory word with other zone flags.

[[email protected]: fix patch interaction]
Signed-off-by: KOSAKI Motohiro <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Wu Fengguang <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Huang Shijie <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KOSAKI Motohiro 2010-03-05 13:41:55 -08:00 • committed by Linus Torvalds
commit 93e4a89a8c
4 changed files with 14 additions and 23 deletions
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2
mm/vmstat.c
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@ -763,7 +763,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
"\n prev_priority: %i"
"\n start_pfn: %lu"
"\n inactive_ratio: %u",
zone_is_all_unreclaimable(zone),
zone->all_unreclaimable,
zone->prev_priority,
zone->zone_start_pfn,
zone->inactive_ratio);