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authorChristoph Lameter <clameter@sgi.com>2006-01-08 01:00:47 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:12:41 -0800
commit930d915252edda7042c944ed3c30194a2f9fe163 (patch)
tree620452f11a9949943765b7a28e5b919f40f32b12 /mm
parent21eac81f252fe31c3cf64b805a1e8652192f3a3b (diff)
downloadop-kernel-dev-930d915252edda7042c944ed3c30194a2f9fe163.zip
op-kernel-dev-930d915252edda7042c944ed3c30194a2f9fe163.tar.gz
[PATCH] Swap Migration V5: PF_SWAPWRITE to allow writing to swap
Add PF_SWAPWRITE to control a processes permission to write to swap. - Use PF_SWAPWRITE in may_write_to_queue() instead of checking for kswapd and pdflush - Set PF_SWAPWRITE flag for kswapd and pdflush Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/pdflush.c2
-rw-r--r--mm/vmscan.c6
2 files changed, 3 insertions, 5 deletions
diff --git a/mm/pdflush.c b/mm/pdflush.c
index 52822c9..c4b6d0a 100644
--- a/mm/pdflush.c
+++ b/mm/pdflush.c
@@ -90,7 +90,7 @@ struct pdflush_work {
static int __pdflush(struct pdflush_work *my_work)
{
- current->flags |= PF_FLUSHER;
+ current->flags |= PF_FLUSHER | PF_SWAPWRITE;
my_work->fn = NULL;
my_work->who = current;
INIT_LIST_HEAD(&my_work->list);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 261a56e..6c30a8c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -268,9 +268,7 @@ static inline int is_page_cache_freeable(struct page *page)
static int may_write_to_queue(struct backing_dev_info *bdi)
{
- if (current_is_kswapd())
- return 1;
- if (current_is_pdflush()) /* This is unlikely, but why not... */
+ if (current->flags & PF_SWAPWRITE)
return 1;
if (!bdi_write_congested(bdi))
return 1;
@@ -1299,7 +1297,7 @@ static int kswapd(void *p)
* us from recursively trying to free more memory as we're
* trying to free the first piece of memory in the first place).
*/
- tsk->flags |= PF_MEMALLOC|PF_KSWAPD;
+ tsk->flags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
order = 0;
for ( ; ; ) {
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