On Thu, Jun 09, 2011 at 11:41:36PM +0900, Minchan Kim wrote:
> Hi Mel,
>
> On Thu, Jun 09, 2011 at 02:33:27PM +0100, Mel Gorman wrote:
> > On Tue, Jun 07, 2011 at 11:38:14PM +0900, Minchan Kim wrote:
> > > acct_isolated of compaction uses page_lru_base_type which returns only
> > > base type of LRU list so it never returns LRU_ACTIVE_ANON or LRU_ACTIVE_FILE.
> > > In addtion, cc->nr_[anon|file] is used in only acct_isolated so it doesn't have
> > > fields in conpact_control.
> > > This patch removes fields from compact_control and makes clear function of
> > > acct_issolated which counts the number of anon|file pages isolated.
> > >
> > > Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> > > Cc: Mel Gorman <mgorman@xxxxxxx>
> > > Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> > > Acked-by: Rik van Riel <riel@xxxxxxxxxx>
> > > Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> > > Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> > > Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
> > > ---
> > > mm/compaction.c | 18 +++++-------------
> > > 1 files changed, 5 insertions(+), 13 deletions(-)
> > >
> > > diff --git a/mm/compaction.c b/mm/compaction.c
> > > index 021a296..61eab88 100644
> > > --- a/mm/compaction.c
> > > +++ b/mm/compaction.c
> > > @@ -35,10 +35,6 @@ struct compact_control {
> > > unsigned long migrate_pfn; /* isolate_migratepages search base */
> > > bool sync; /* Synchronous migration */
> > >
> > > - /* Account for isolated anon and file pages */
> > > - unsigned long nr_anon;
> > > - unsigned long nr_file;
> > > -
> > > unsigned int order; /* order a direct compactor needs */
> > > int migratetype; /* MOVABLE, RECLAIMABLE etc */
> > > struct zone *zone;
> > > @@ -212,17 +208,13 @@ static void isolate_freepages(struct zone *zone,
> > > static void acct_isolated(struct zone *zone, struct compact_control *cc)
> > > {
> > > struct page *page;
> > > - unsigned int count[NR_LRU_LISTS] = { 0, };
> > > + unsigned int count[2] = { 0, };
> > >
> > > - list_for_each_entry(page, &cc->migratepages, lru) {
> > > - int lru = page_lru_base_type(page);
> > > - count[lru]++;
> > > - }
> > > + list_for_each_entry(page, &cc->migratepages, lru)
> > > + count[!!page_is_file_cache(page)]++;
> > >
> > > - cc->nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
> > > - cc->nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
> > > - __mod_zone_page_state(zone, NR_ISOLATED_ANON, cc->nr_anon);
> > > - __mod_zone_page_state(zone, NR_ISOLATED_FILE, cc->nr_file);
> > > + __mod_zone_page_state(zone, NR_ISOLATED_ANON, count[0]);
> > > + __mod_zone_page_state(zone, NR_ISOLATED_FILE, count[1]);
> >
> > You are hard-coding assumptions about the value of LRU_INACTIVE_ANON
> > and LRU_INACTIVE_FILE here. I have no expectation that these will
>
> I used page_is_file_cache and logical not.
> If page_is_file_cache returns zero(ie, anon), logicacl not makes it with 0.
> If page_is_file_cache doesn't return zero(ie, file), logical not makes it with 1.
> So, anon pages would be put in count[0] and file pages would be in count[1].
>
> Do I miss your point?
>
Nope, I simply missed the !!page_is_file_cache part and was still
seeing count[] in its old meaning - sorry, my bad. The patch now
makes sense to me.
Acked-by: Mel Gorman <mgorman@xxxxxxx>
--
Mel Gorman
SUSE Labs
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