From: Rik van Riel <riel@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, akpm@linux-foundation.org
Subject: [PATCH] kswapd should only wait on IO if there is IO
Date: Thu, 27 Sep 2007 17:08:16 -0400 [thread overview]
Message-ID: <20070927170816.055548fd@bree.surriel.com> (raw)
The current kswapd (and try_to_free_pages) code has an oddity where the
code will wait on IO, even if there is no IO in flight. This problem is
notable especially when the system scans through many unfreeable pages,
causing unnecessary stalls in the VM.
Signed-off-by: Rik van Riel <riel@surriel.com>
diff -up linux-2.6.22.x86_64/mm/vmscan.c.wait linux-2.6.22.x86_64/mm/vmscan.c
--- linux-2.6.22.x86_64/mm/vmscan.c.wait 2007-09-25 11:33:30.000000000 -0400
+++ linux-2.6.22.x86_64/mm/vmscan.c 2007-09-25 21:27:08.000000000 -0400
@@ -68,6 +68,8 @@ struct scan_control {
int all_unreclaimable;
int order;
+
+ int nr_io_pages;
};
#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
@@ -489,8 +491,10 @@ static unsigned long shrink_page_list(st
*/
if (sync_writeback == PAGEOUT_IO_SYNC && may_enter_fs)
wait_on_page_writeback(page);
- else
+ else {
+ sc->nr_io_pages++;
goto keep_locked;
+ }
}
referenced = page_referenced(page, 1);
@@ -541,8 +545,10 @@ static unsigned long shrink_page_list(st
case PAGE_ACTIVATE:
goto activate_locked;
case PAGE_SUCCESS:
- if (PageWriteback(page) || PageDirty(page))
+ if (PageWriteback(page) || PageDirty(page)) {
+ sc->nr_io_pages++;
goto keep;
+ }
/*
* A synchronous write - probably a ramdisk. Go
* ahead and try to reclaim the page.
@@ -1201,6 +1207,7 @@ unsigned long try_to_free_pages(struct z
for (priority = DEF_PRIORITY; priority >= 0; priority--) {
sc.nr_scanned = 0;
+ sc.nr_io_pages = 0;
if (!priority)
disable_swap_token();
nr_reclaimed += shrink_zones(priority, zones, &sc);
@@ -1229,7 +1236,8 @@ unsigned long try_to_free_pages(struct z
}
/* Take a nap, wait for some writeback to complete */
- if (sc.nr_scanned && priority < DEF_PRIORITY - 2)
+ if (sc.nr_scanned && priority < DEF_PRIORITY - 2 &&
+ sc.nr_io_pages > sc.swap_cluster_max)
congestion_wait(WRITE, HZ/10);
}
/* top priority shrink_caches still had more to do? don't OOM, then */
@@ -1315,6 +1323,7 @@ loop_again:
if (!priority)
disable_swap_token();
+ sc.nr_io_pages = 0;
all_zones_ok = 1;
/*
@@ -1398,7 +1407,8 @@ loop_again:
* OK, kswapd is getting into trouble. Take a nap, then take
* another pass across the zones.
*/
- if (total_scanned && priority < DEF_PRIORITY - 2)
+ if (total_scanned && priority < DEF_PRIORITY - 2 &&
+ sc.nr_io_pages > sc.swap_cluster_max)
congestion_wait(WRITE, HZ/10);
/*
--
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next reply other threads:[~2007-09-27 21:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-27 21:08 Rik van Riel [this message]
2007-09-27 21:47 ` [PATCH] kswapd should only wait on IO if there is IO Andrew Morton
2007-09-27 22:13 ` Rik van Riel
2007-09-27 22:21 ` Andrew Morton
2007-09-27 22:50 ` Rik van Riel
2007-09-27 22:59 ` Andrew Morton
2007-09-27 23:08 ` Rik van Riel
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