The patch titled
Subject: mm-annotate-refault-stalls-from-swap_readpage-fix
has been added to the -mm tree. Its filename is
mm-annotate-refault-stalls-from-swap_readpage-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-annotate-refault-stalls-from-swap_readpage-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-annotate-refault-stalls-from-swap_readpage-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-annotate-refault-stalls-from-swap_readpage-fix
add comment, per Johannes
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_io.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/mm/page_io.c~mm-annotate-refault-stalls-from-swap_readpage-fix
+++ a/mm/page_io.c
@@ -361,6 +361,11 @@ int swap_readpage(struct page *page, boo
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageUptodate(page), page);
+ /*
+ * Count submission time as memory stall. When the device is congested,
+ * or the submitting cgroup IO-throttled, submission can be a
+ * significant part of overall IO time.
+ */
psi_memstall_enter(&pflags);
if (frontswap_load(page) == 0) {
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
mm-slub-fix-a-deadlock-in-show_slab_objects-fix.patch
ocfs2-protect-extent-tree-in-the-ocfs2_prepare_inode_for_write-checkpatch-fixes.patch
mm.patch
mm-pgmap-use-correct-alignment-when-looking-at-first-pfn-from-a-region-checkpatch-fixes.patch
mm-oom-avoid-printk-iteration-under-rcu-fix.patch
hugetlb-remove-duplicated-code-checkpatch-fixes.patch
hugetlb-remove-unused-hstate-in-hugetlb_fault_mutex_hash-fix.patch
mm-annotate-refault-stalls-from-swap_readpage-fix.patch
linux-next-git-rejects.patch
diff-sucks.patch
samples-watch_queue-watch_test-fix-build.patch
drivers-tty-serial-sh-scic-suppress-warning.patch
kernel-forkc-export-kernel_thread-to-modules.patch
