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authorTejun Heo <tj@kernel.org>2018-07-03 11:14:56 -0400
committerJens Axboe <axboe@kernel.dk>2018-07-09 09:07:54 -0600
commit2cf855837b89d92996cf264713f3bed2bf9b0b4f (patch)
treed2e61e78a5dce7925bebb7c50d345838aa948b4a /mm/memory.c
parentd09d8df3a29403693d9d20cc34ed101f2c558e2b (diff)
downloadlwn-2cf855837b89d92996cf264713f3bed2bf9b0b4f.tar.gz
lwn-2cf855837b89d92996cf264713f3bed2bf9b0b4f.zip
memcontrol: schedule throttling if we are congested
Memory allocations can induce swapping via kswapd or direct reclaim. If we are having IO done for us by kswapd and don't actually go into direct reclaim we may never get scheduled for throttling. So instead check to see if our cgroup is congested, and if so schedule the throttling. Before we return to user space the throttling stuff will only throttle if we actually required it. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 7206a634270b..dfe80c574282 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2503,7 +2503,7 @@ static int wp_page_copy(struct vm_fault *vmf)
cow_user_page(new_page, old_page, vmf->address, vma);
}
- if (mem_cgroup_try_charge(new_page, mm, GFP_KERNEL, &memcg, false))
+ if (mem_cgroup_try_charge_delay(new_page, mm, GFP_KERNEL, &memcg, false))
goto oom_free_new;
__SetPageUptodate(new_page);
@@ -3003,8 +3003,8 @@ int do_swap_page(struct vm_fault *vmf)
goto out_page;
}
- if (mem_cgroup_try_charge(page, vma->vm_mm, GFP_KERNEL,
- &memcg, false)) {
+ if (mem_cgroup_try_charge_delay(page, vma->vm_mm, GFP_KERNEL,
+ &memcg, false)) {
ret = VM_FAULT_OOM;
goto out_page;
}
@@ -3165,7 +3165,8 @@ static int do_anonymous_page(struct vm_fault *vmf)
if (!page)
goto oom;
- if (mem_cgroup_try_charge(page, vma->vm_mm, GFP_KERNEL, &memcg, false))
+ if (mem_cgroup_try_charge_delay(page, vma->vm_mm, GFP_KERNEL, &memcg,
+ false))
goto oom_free_page;
/*
@@ -3661,7 +3662,7 @@ static int do_cow_fault(struct vm_fault *vmf)
if (!vmf->cow_page)
return VM_FAULT_OOM;
- if (mem_cgroup_try_charge(vmf->cow_page, vma->vm_mm, GFP_KERNEL,
+ if (mem_cgroup_try_charge_delay(vmf->cow_page, vma->vm_mm, GFP_KERNEL,
&vmf->memcg, false)) {
put_page(vmf->cow_page);
return VM_FAULT_OOM;