On 03/02/2012 12:17 PM, KAMEZAWA Hiroyuki wrote:
On Fri, 02 Mar 2012 09:51:27 +0400
Konstantin Khlebnikov<khlebnikov@xxxxxxxxxx> wrote:
KAMEZAWA Hiroyuki wrote:
On Wed, 29 Feb 2012 13:15:47 +0400
Konstantin Khlebnikov<khlebnikov@xxxxxxxxxx> wrote:
This patch adds file/anon filter bits into isolate_mode_t,
this allows to simplify checks in __isolate_lru_page().
Signed-off-by: Konstantin Khlebnikov<khlebnikov@xxxxxxxxxx>
Hmm.. I like idea but..
---
include/linux/mmzone.h | 4 ++++
include/linux/swap.h | 2 +-
mm/compaction.c | 5 +++--
mm/vmscan.c | 27 +++++++++++++--------------
4 files changed, 21 insertions(+), 17 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index eff4918..2fed935 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -193,6 +193,10 @@ struct lruvec {
#define ISOLATE_UNMAPPED ((__force isolate_mode_t)0x8)
/* Isolate for asynchronous migration */
#define ISOLATE_ASYNC_MIGRATE ((__force isolate_mode_t)0x10)
+/* Isolate swap-backed pages */
+#define ISOLATE_ANON ((__force isolate_mode_t)0x20)
+/* Isolate file-backed pages */
+#define ISOLATE_FILE ((__force isolate_mode_t)0x40)
/* LRU Isolation modes. */
typedef unsigned __bitwise__ isolate_mode_t;
diff --git a/include/linux/swap.h b/include/linux/swap.h
index ba2c8d7..dc6e6a3 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -254,7 +254,7 @@ static inline void lru_cache_add_file(struct page *page)
/* linux/mm/vmscan.c */
extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
gfp_t gfp_mask, nodemask_t *mask);
-extern int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file);
+extern int __isolate_lru_page(struct page *page, isolate_mode_t mode);
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
gfp_t gfp_mask, bool noswap);
extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
diff --git a/mm/compaction.c b/mm/compaction.c
index 74a8c82..cc054f7 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -261,7 +261,8 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
unsigned long last_pageblock_nr = 0, pageblock_nr;
unsigned long nr_scanned = 0, nr_isolated = 0;
struct list_head *migratelist =&cc->migratepages;
- isolate_mode_t mode = ISOLATE_ACTIVE|ISOLATE_INACTIVE;
+ isolate_mode_t mode = ISOLATE_ACTIVE | ISOLATE_INACTIVE |
+ ISOLATE_FILE | ISOLATE_ANON;
/* Do not scan outside zone boundaries */
low_pfn = max(cc->migrate_pfn, zone->zone_start_pfn);
@@ -375,7 +376,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
mode |= ISOLATE_ASYNC_MIGRATE;
/* Try isolate the page */
- if (__isolate_lru_page(page, mode, 0) != 0)
+ if (__isolate_lru_page(page, mode) != 0)
continue;
VM_BUG_ON(PageTransCompound(page));
diff --git a/mm/vmscan.c b/mm/vmscan.c
index af6cfe7..1b70338 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1029,27 +1029,18 @@ keep_lumpy:
*
* returns 0 on success, -ve errno on failure.
*/
-int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
+int __isolate_lru_page(struct page *page, isolate_mode_t mode)
{
- bool all_lru_mode;
int ret = -EINVAL;
/* Only take pages on the LRU. */
if (!PageLRU(page))
return ret;
- all_lru_mode = (mode& (ISOLATE_ACTIVE|ISOLATE_INACTIVE)) ==
- (ISOLATE_ACTIVE|ISOLATE_INACTIVE);
-
- /*
- * When checking the active state, we need to be sure we are
- * dealing with comparible boolean values. Take the logical not
- * of each.
- */
- if (!all_lru_mode&& !PageActive(page) != !(mode& ISOLATE_ACTIVE))
+ if (!(mode& (PageActive(page) ? ISOLATE_ACTIVE : ISOLATE_INACTIVE)))
return ret;
Isn't this complicated ?
But it doesn't blows my mind as old code does =)
Maybe someone can propose more clear variant?
switch (mode& (ISOLATE_ACTIVE | ISOLATE_INACTIVE)) {
case ISOLATE_ACTIVE :
if (!PageActive(page))
return ret;
case ISOLATE_INACTIVE :
if (PageActive(page))
return ret;
default:
break;
}
}
?
Thanks,
-Kame
The switch gets a little bit too big (vertical-wise). Maybe just
splitting it into two lines is enough to clarify its purpose.
How about:
int tmp_var = PageActive(page) ? ISOLATE_ACTIVE : ISOLATE_INACTIVE
if (!(mode & tmp_var))
ret;
--
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