The patch titled
Subject: mmu-notifier-add-clear_young-callback-fix
has been added to the -mm tree. Its filename is
mmu-notifier-add-clear_young-callback-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mmu-notifier-add-clear_young-callback-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mmu-notifier-add-clear_young-callback-fix.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: mmu-notifier-add-clear_young-callback-fix
Cc: Andres Lagar-Cavilla <andreslc@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
virt/kvm/kvm_main.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff -puN virt/kvm/kvm_main.c~mmu-notifier-add-clear_young-callback-fix virt/kvm/kvm_main.c
--- a/virt/kvm/kvm_main.c~mmu-notifier-add-clear_young-callback-fix
+++ a/virt/kvm/kvm_main.c
@@ -397,6 +397,19 @@ static int kvm_mmu_notifier_clear_young(
idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
+ /*
+ * Even though we do not flush TLB, this will still adversely
+ * affect performance on pre-Haswell Intel EPT, where there is
+ * no EPT Access Bit to clear so that we have to tear down EPT
+ * tables instead. If we find this unacceptable, we can always
+ * add a parameter to kvm_age_hva so that it effectively doesn't
+ * do anything on clear_young.
+ *
+ * Also note that currently we never issue secondary TLB flushes
+ * from clear_young, leaving this job up to the regular system
+ * cadence. If we find this inaccurate, we might come up with a
+ * more sophisticated heuristic later.
+ */
young = kvm_age_hva(kvm, start, end);
spin_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
memcg-export-struct-mem_cgroup.patch
memcg-export-struct-mem_cgroup-fix.patch
memcg-export-struct-mem_cgroup-fix-2.patch
memcg-get-rid-of-mem_cgroup_root_css-for-config_memcg.patch
memcg-get-rid-of-extern-for-functions-in-memcontrolh.patch
memcg-restructure-mem_cgroup_can_attach.patch
memcg-tcp_kmem-check-for-cg_proto-in-sock_update_memcg.patch
memcg-add-page_cgroup_ino-helper.patch
hwpoison-use-page_cgroup_ino-for-filtering-by-memcg.patch
memcg-zap-try_get_mem_cgroup_from_page.patch
proc-add-kpagecgroup-file.patch
mmu-notifier-add-clear_young-callback.patch
mmu-notifier-add-clear_young-callback-fix.patch
proc-add-kpageidle-file.patch
proc-export-idle-flag-via-kpageflags.patch
proc-add-cond_resched-to-proc-kpage-read-write-loop.patch
mm-vmscan-fix-the-page-state-calculation-in-too_many_isolated.patch
mm-swap-zswap-maybe_preload-refactoring.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
