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authorShailabh Nagar <nagar@watson.ibm.com>2006-07-14 00:24:37 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-14 21:53:56 -0700
commit0ff922452df86f3e9a2c6f705c4588ec62d096a7 (patch)
treeac84041bfb63f12d0e2db733c46b2cd2438b4882 /mm
parentca74e92b4698276b6696f15a801759f50944f387 (diff)
downloadop-kernel-dev-0ff922452df86f3e9a2c6f705c4588ec62d096a7.zip
op-kernel-dev-0ff922452df86f3e9a2c6f705c4588ec62d096a7.tar.gz
[PATCH] per-task-delay-accounting: sync block I/O and swapin delay collection
Unlike earlier iterations of the delay accounting patches, now delays are only collected for the actual I/O waits rather than try and cover the delays seen in I/O submission paths. Account separately for block I/O delays incurred as a result of swapin page faults whose frequency can be affected by the task/process' rss limit. Hence swapin delays can act as feedback for rss limit changes independent of I/O priority changes. Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com> Signed-off-by: Balbir Singh <balbir@in.ibm.com> Cc: Jes Sorensen <jes@sgi.com> Cc: Peter Chubb <peterc@gelato.unsw.edu.au> Cc: Erich Focht <efocht@ess.nec.de> Cc: Levent Serinol <lserinol@gmail.com> Cc: Jay Lan <jlan@engr.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/memory.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index de8bc85..109e986 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -47,6 +47,7 @@
#include <linux/pagemap.h>
#include <linux/rmap.h>
#include <linux/module.h>
+#include <linux/delayacct.h>
#include <linux/init.h>
#include <asm/pgalloc.h>
@@ -1934,6 +1935,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
migration_entry_wait(mm, pmd, address);
goto out;
}
+ delayacct_set_flag(DELAYACCT_PF_SWAPIN);
page = lookup_swap_cache(entry);
if (!page) {
swapin_readahead(entry, address, vma);
@@ -1946,6 +1948,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
if (likely(pte_same(*page_table, orig_pte)))
ret = VM_FAULT_OOM;
+ delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
goto unlock;
}
@@ -1955,6 +1958,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
grab_swap_token();
}
+ delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
mark_page_accessed(page);
lock_page(page);
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