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authorChristoph Lameter <clameter@sgi.com>2006-01-08 04:00:47 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 23:12:41 -0500
commit930d915252edda7042c944ed3c30194a2f9fe163 (patch)
tree620452f11a9949943765b7a28e5b919f40f32b12 /mm/vmscan.c
parent21eac81f252fe31c3cf64b805a1e8652192f3a3b (diff)
[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/vmscan.c')
-rw-r--r--mm/vmscan.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 261a56ee11b6..6c30a8c59795 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -268,9 +268,7 @@ static inline int is_page_cache_freeable(struct page *page)
268 268
269static int may_write_to_queue(struct backing_dev_info *bdi) 269static int may_write_to_queue(struct backing_dev_info *bdi)
270{ 270{
271 if (current_is_kswapd()) 271 if (current->flags & PF_SWAPWRITE)
272 return 1;
273 if (current_is_pdflush()) /* This is unlikely, but why not... */
274 return 1; 272 return 1;
275 if (!bdi_write_congested(bdi)) 273 if (!bdi_write_congested(bdi))
276 return 1; 274 return 1;
@@ -1299,7 +1297,7 @@ static int kswapd(void *p)
1299 * us from recursively trying to free more memory as we're 1297 * us from recursively trying to free more memory as we're
1300 * trying to free the first piece of memory in the first place). 1298 * trying to free the first piece of memory in the first place).
1301 */ 1299 */
1302 tsk->flags |= PF_MEMALLOC|PF_KSWAPD; 1300 tsk->flags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
1303 1301
1304 order = 0; 1302 order = 0;
1305 for ( ; ; ) { 1303 for ( ; ; ) {