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authorEbru Akagunduz <ebru.akagunduz@gmail.com>2016-07-26 15:25:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commit8a966ed746d63c8103d496da85973eeeec01d77f (patch)
treea96bcdb72409c34910440549c2e4fa248a468c4e /include
parent70652f6ec0566ae6b4147d88c6d043c68484227f (diff)
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mm: make swapin readahead to improve thp collapse rate
This patch makes swapin readahead to improve thp collapse rate. When khugepaged scanned pages, there can be a few of the pages in swap area. With the patch THP can collapse 4kB pages into a THP when there are up to max_ptes_swap swap ptes in a 2MB range. The patch was tested with a test program that allocates 400B of memory, writes to it, and then sleeps. I force the system to swap out all. Afterwards, the test program touches the area by writing, it skips a page in each 20 pages of the area. Without the patch, system did not swap in readahead. THP rate was %65 of the program of the memory, it did not change over time. With this patch, after 10 minutes of waiting khugepaged had collapsed %99 of the program's memory. [kirill.shutemov@linux.intel.com: trivial cleanup of exit path of the function] [kirill.shutemov@linux.intel.com: __collapse_huge_page_swapin(): drop unused 'pte' parameter] [kirill.shutemov@linux.intel.com: do not hold anon_vma lock during swap in] Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Xie XiuQi <xiexiuqi@huawei.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: David Rientjes <rientjes@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/trace/events/huge_memory.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h
index fad6539c9d68..bda21183eb05 100644
--- a/include/trace/events/huge_memory.h
+++ b/include/trace/events/huge_memory.h
@@ -135,5 +135,29 @@ TRACE_EVENT(mm_collapse_huge_page_isolate,
__print_symbolic(__entry->status, SCAN_STATUS))
);
+TRACE_EVENT(mm_collapse_huge_page_swapin,
+
+ TP_PROTO(struct mm_struct *mm, int swapped_in, int ret),
+
+ TP_ARGS(mm, swapped_in, ret),
+
+ TP_STRUCT__entry(
+ __field(struct mm_struct *, mm)
+ __field(int, swapped_in)
+ __field(int, ret)
+ ),
+
+ TP_fast_assign(
+ __entry->mm = mm;
+ __entry->swapped_in = swapped_in;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("mm=%p, swapped_in=%d, ret=%d",
+ __entry->mm,
+ __entry->swapped_in,
+ __entry->ret)
+);
+
#endif /* __HUGE_MEMORY_H */
#include <trace/define_trace.h>