Subject: + arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom.patch added to -mm tree
To: hannes@xxxxxxxxxxx,azurit@xxxxxxxx,kamezawa.hiroyu@xxxxxxxxxxxxxx,kosaki.motohiro@xxxxxxxxxxxxxx,mhocko@xxxxxxx,rientjes@xxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 05 Aug 2013 15:05:51 -0700
The patch titled
Subject: arch: mm: do not invoke OOM killer on kernel fault OOM
has been added to the -mm tree. Its filename is
arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: arch: mm: do not invoke OOM killer on kernel fault OOM
Kernel faults are expected to handle OOM conditions gracefully (gup,
uaccess etc.), so they should never invoke the OOM killer. Reserve this
for faults triggered in user context when it is the only option.
Most architectures already do this, fix up the remaining few.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: azurIt <azurit@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/mm/fault.c | 14 +++++++-------
arch/arm64/mm/fault.c | 14 +++++++-------
arch/avr32/mm/fault.c | 2 +-
arch/mips/mm/fault.c | 2 ++
arch/um/kernel/trap.c | 2 ++
arch/unicore32/mm/fault.c | 14 +++++++-------
6 files changed, 26 insertions(+), 22 deletions(-)
diff -puN arch/arm/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom arch/arm/mm/fault.c
--- a/arch/arm/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom
+++ a/arch/arm/mm/fault.c
@@ -349,6 +349,13 @@ retry:
if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))
return 0;
+ /*
+ * If we are in kernel mode at this point, we
+ * have no context to handle this fault with.
+ */
+ if (!user_mode(regs))
+ goto no_context;
+
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and return to
@@ -359,13 +366,6 @@ retry:
return 0;
}
- /*
- * If we are in kernel mode at this point, we
- * have no context to handle this fault with.
- */
- if (!user_mode(regs))
- goto no_context;
-
if (fault & VM_FAULT_SIGBUS) {
/*
* We had some memory, but were unable to
diff -puN arch/arm64/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom arch/arm64/mm/fault.c
--- a/arch/arm64/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom
+++ a/arch/arm64/mm/fault.c
@@ -288,6 +288,13 @@ retry:
VM_FAULT_BADACCESS))))
return 0;
+ /*
+ * If we are in kernel mode at this point, we have no context to
+ * handle this fault with.
+ */
+ if (!user_mode(regs))
+ goto no_context;
+
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and return to
@@ -298,13 +305,6 @@ retry:
return 0;
}
- /*
- * If we are in kernel mode at this point, we have no context to
- * handle this fault with.
- */
- if (!user_mode(regs))
- goto no_context;
-
if (fault & VM_FAULT_SIGBUS) {
/*
* We had some memory, but were unable to successfully fix up
diff -puN arch/avr32/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom arch/avr32/mm/fault.c
--- a/arch/avr32/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom
+++ a/arch/avr32/mm/fault.c
@@ -228,9 +228,9 @@ no_context:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- pagefault_out_of_memory();
if (!user_mode(regs))
goto no_context;
+ pagefault_out_of_memory();
return;
do_sigbus:
diff -puN arch/mips/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom arch/mips/mm/fault.c
--- a/arch/mips/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom
+++ a/arch/mips/mm/fault.c
@@ -241,6 +241,8 @@ out_of_memory:
* (which will retry the fault, or kill us if we got oom-killed).
*/
up_read(&mm->mmap_sem);
+ if (!user_mode(regs))
+ goto no_context;
pagefault_out_of_memory();
return;
diff -puN arch/um/kernel/trap.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom arch/um/kernel/trap.c
--- a/arch/um/kernel/trap.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom
+++ a/arch/um/kernel/trap.c
@@ -124,6 +124,8 @@ out_of_memory:
* (which will retry the fault, or kill us if we got oom-killed).
*/
up_read(&mm->mmap_sem);
+ if (!is_user)
+ goto out_nosemaphore;
pagefault_out_of_memory();
return 0;
}
diff -puN arch/unicore32/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom arch/unicore32/mm/fault.c
--- a/arch/unicore32/mm/fault.c~arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom
+++ a/arch/unicore32/mm/fault.c
@@ -278,6 +278,13 @@ retry:
(VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))
return 0;
+ /*
+ * If we are in kernel mode at this point, we
+ * have no context to handle this fault with.
+ */
+ if (!user_mode(regs))
+ goto no_context;
+
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and return to
@@ -288,13 +295,6 @@ retry:
return 0;
}
- /*
- * If we are in kernel mode at this point, we
- * have no context to handle this fault with.
- */
- if (!user_mode(regs))
- goto no_context;
-
if (fault & VM_FAULT_SIGBUS) {
/*
* We had some memory, but were unable to
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
memcg-dont-initialize-kmem-cache-destroying-work-for-root-caches.patch
mm-kill-one-if-loop-in-__free_pages_bootmem.patch
mm-vmscan-fix-numa-reclaim-balance-problem-in-kswapd.patch
mm-page_alloc-rearrange-watermark-checking-in-get_page_from_freelist.patch
mm-page_alloc-fair-zone-allocator-policy.patch
mm-revert-page-writebackc-subtract-min_free_kbytes-from-dirtyable-memory.patch
memcg-remove-redundant-code-in-mem_cgroup_force_empty_write.patch
memcg-vmscan-integrate-soft-reclaim-tighter-with-zone-shrinking-code.patch
memcg-get-rid-of-soft-limit-tree-infrastructure.patch
vmscan-memcg-do-softlimit-reclaim-also-for-targeted-reclaim.patch
memcg-enhance-memcg-iterator-to-support-predicates.patch
memcg-track-children-in-soft-limit-excess-to-improve-soft-limit.patch
memcg-vmscan-do-not-attempt-soft-limit-reclaim-if-it-would-not-scan-anything.patch
memcg-track-all-children-over-limit-in-the-root.patch
memcg-vmscan-do-not-fall-into-reclaim-all-pass-too-quickly.patch
arch-mm-remove-obsolete-init-oom-protection.patch
arch-mm-do-not-invoke-oom-killer-on-kernel-fault-oom.patch
arch-mm-pass-userspace-fault-flag-to-generic-fault-handler.patch
x86-finish-user-fault-error-path-with-fatal-signal.patch
mm-memcg-enable-memcg-oom-killer-only-for-user-faults.patch
mm-memcg-rework-and-document-oom-waiting-and-wakeup.patch
mm-memcg-do-not-trap-chargers-with-full-callstack-on-oom.patch
swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix.patch
debugging-keep-track-of-page-owners-fix-2-fix-fix-fix.patch
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