The patch titled
Subject: mm,vmacache: count number of system-wide flushes
has been added to the -mm tree. Its filename is
mmvmacache-count-number-of-system-wide-flushes.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mmvmacache-count-number-of-system-wide-flushes.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/mmvmacache-count-number-of-system-wide-flushes.patch
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------------------------------------------------------
From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Subject: mm,vmacache: count number of system-wide flushes
These flushes deal with sequence number overflows, such as for long lived
threads. These are rare, but interesting from a debugging PoV. As such,
display the number of flushes when vmacache debugging is enabled.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/vm_event_item.h | 1 +
mm/vmacache.c | 2 ++
mm/vmstat.c | 1 +
3 files changed, 4 insertions(+)
diff -puN include/linux/vm_event_item.h~mmvmacache-count-number-of-system-wide-flushes include/linux/vm_event_item.h
--- a/include/linux/vm_event_item.h~mmvmacache-count-number-of-system-wide-flushes
+++ a/include/linux/vm_event_item.h
@@ -91,6 +91,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
#ifdef CONFIG_DEBUG_VM_VMACACHE
VMACACHE_FIND_CALLS,
VMACACHE_FIND_HITS,
+ VMACACHE_FULL_FLUSHES,
#endif
NR_VM_EVENT_ITEMS
};
diff -puN mm/vmacache.c~mmvmacache-count-number-of-system-wide-flushes mm/vmacache.c
--- a/mm/vmacache.c~mmvmacache-count-number-of-system-wide-flushes
+++ a/mm/vmacache.c
@@ -17,6 +17,8 @@ void vmacache_flush_all(struct mm_struct
{
struct task_struct *g, *p;
+ count_vm_vmacache_event(VMACACHE_FULL_FLUSHES);
+
/*
* Single threaded tasks need not iterate the entire
* list of process. We can avoid the flushing as well
diff -puN mm/vmstat.c~mmvmacache-count-number-of-system-wide-flushes mm/vmstat.c
--- a/mm/vmstat.c~mmvmacache-count-number-of-system-wide-flushes
+++ a/mm/vmstat.c
@@ -901,6 +901,7 @@ const char * const vmstat_text[] = {
#ifdef CONFIG_DEBUG_VM_VMACACHE
"vmacache_find_calls",
"vmacache_find_hits",
+ "vmacache_full_flushes",
#endif
#endif /* CONFIG_VM_EVENTS_COUNTERS */
};
_
Patches currently in -mm which might be from dave@xxxxxxxxxxxx are
ipc-semc-fully-initialize-sem_array-before-making-it-visible.patch
mmfs-introduce-helpers-around-the-i_mmap_mutex.patch
mm-use-new-helper-functions-around-the-i_mmap_mutex.patch
mm-convert-i_mmap_mutex-to-rwsem.patch
mm-convert-i_mmap_mutex-to-rwsem-fix.patch
mm-rmap-share-the-i_mmap_rwsem.patch
uprobes-share-the-i_mmap_rwsem.patch
mm-xip-share-the-i_mmap_rwsem.patch
mm-memory-failure-share-the-i_mmap_rwsem.patch
mm-nommu-share-the-i_mmap_rwsem.patch
mm-memoryc-share-the-i_mmap_rwsem.patch
mm-rmap-calculate-page-offset-when-needed.patch
hugetlb-fix-hugepages=-entry-in-kernel-parameterstxt.patch
hugetlb-alloc_bootmem_huge_page-use-is_aligned.patch
hugetlb-hugetlb_register_all_nodes-add-__init-marker.patch
mmvmacache-count-number-of-system-wide-flushes.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix-fix.patch
ipc-semc-increase-semmsl-semmni-semopm.patch
ipc-msg-increase-msgmni-remove-scaling.patch
ipc-msg-increase-msgmni-remove-scaling-checkpatch-fixes.patch
mm-fix-overly-aggressive-shmdt-when-calls-span-multiple-segments.patch
shmdt-use-i_size_read-instead-of-i_size.patch
linux-next.patch
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