Subject: [merged] mmvmacache-optimize-overflow-system-wide-flushing.patch removed from -mm tree
To: davidlohr@xxxxxx,aswin@xxxxxx,oleg@xxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 05 Jun 2014 12:49:01 -0700
The patch titled
Subject: mm,vmacache: optimize overflow system-wide flushing
has been removed from the -mm tree. Its filename was
mmvmacache-optimize-overflow-system-wide-flushing.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Davidlohr Bueso <davidlohr@xxxxxx>
Subject: mm,vmacache: optimize overflow system-wide flushing
For single threaded workloads, we can avoid flushing and iterating through
the entire list of tasks, making the whole function a lot faster,
requiring only a single atomic read for the mm_users.
Signed-off-by: Davidlohr Bueso <davidlohr@xxxxxx>
Suggested-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Aswin Chandramouleeswaran <aswin@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmacache.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN mm/vmacache.c~mmvmacache-optimize-overflow-system-wide-flushing mm/vmacache.c
--- a/mm/vmacache.c~mmvmacache-optimize-overflow-system-wide-flushing
+++ a/mm/vmacache.c
@@ -17,6 +17,16 @@ void vmacache_flush_all(struct mm_struct
{
struct task_struct *g, *p;
+ /*
+ * Single threaded tasks need not iterate the entire
+ * list of process. We can avoid the flushing as well
+ * since the mm's seqnum was increased and don't have
+ * to worry about other threads' seqnum. Current's
+ * flush will occur upon the next lookup.
+ */
+ if (atomic_read(&mm->mm_users) == 1)
+ return;
+
rcu_read_lock();
for_each_process_thread(g, p) {
/*
_
Patches currently in -mm which might be from davidlohr@xxxxxx are
origin.patch
m68k-call-find_vma-with-the-mmap_sem-held-in-sys_cacheflush.patch
ipc-constify-ipc_ops.patch
ipc-shmc-check-for-ulong-overflows-in-shmat.patch
ipc-shmc-check-for-overflows-of-shm_tot.patch
ipc-shmc-check-for-integer-overflow-during-shmget.patch
ipc-shmc-increase-the-defaults-for-shmall-shmmax.patch
ipcshm-document-new-limits-in-the-uapi-header.patch
ipcshm-document-new-limits-in-the-uapi-header-v2.patch
ipcshm-document-new-limits-in-the-uapi-header-v3.patch
ipcmsg-use-current-state-helpers.patch
ipcmsg-move-some-msgq-ns-code-around.patch
ipcmsg-document-volatile-r_msg.patch
ipc-semc-add-a-printk_once-for-semctlgetncnt-getzcnt.patch
linux-next.patch
blackfin-ptrace-call-find_vma-with-the-mmap_sem-held.patch
rwsem-support-optimistic-spinning.patch
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