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| author |   Tejun Heo <tj@kernel.org> | 2018-06-07 17:05:31 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-07 17:34:34 -0700 |
| commit | bb98f2c5ac5db92d34908dbac81a8de7c47c8353 (patch) | |
| tree | e8545ddd4cc053639171a106e958bb40f5f021bd | |
| parent | mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct (diff) | |
| download | linux-dev-bb98f2c5ac5db92d34908dbac81a8de7c47c8353.tar.xz linux-dev-bb98f2c5ac5db92d34908dbac81a8de7c47c8353.zip | |
mm, memcontrol: move swap charge handling into get_swap_page()
Patch series "mm, memcontrol: Implement memory.swap.events", v2.
This patchset implements memory.swap.events which contains max and fail
events so that userland can monitor and respond to swap running out.
This patch (of 2):
get_swap_page() is always followed by mem_cgroup_try_charge_swap().
This patch moves mem_cgroup_try_charge_swap() into get_swap_page() and
makes get_swap_page() call the function even after swap allocation
failure.
This simplifies the callers and consolidates memcg related logic and
will ease adding swap related memcg events.
Link: http://lkml.kernel.org/r/20180416230934.GH1911913@devbig577.frc2.facebook.com
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/memcontrol.c | 3 | ||||
| -rw-r--r-- | mm/shmem.c | 4 | ||||
| -rw-r--r-- | mm/swap_slots.c | 10 | ||||
| -rw-r--r-- | mm/swap_state.c | 3 |
4 files changed, 10 insertions, 10 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 1695f38630f1..e8166521a474 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6012,6 +6012,9 @@ int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry) if (!memcg) return 0; + if (!entry.val) + return 0; + memcg = mem_cgroup_id_get_online(memcg); if (!mem_cgroup_is_root(memcg) && diff --git a/mm/shmem.c b/mm/shmem.c index 9d6c7e595415..8c43e207cd3b 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1322,9 +1322,6 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc) if (!swap.val) goto redirty; - if (mem_cgroup_try_charge_swap(page, swap)) - goto free_swap; - /* * Add inode to shmem_unuse()'s list of swapped-out inodes, * if it's not already there. Do it now before the page is @@ -1353,7 +1350,6 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc) } mutex_unlock(&shmem_swaplist_mutex); -free_swap: put_swap_page(page, swap); redirty: set_page_dirty(page); diff --git a/mm/swap_slots.c b/mm/swap_slots.c index f2641894f440..f51ac051c0c9 100644 --- a/mm/swap_slots.c +++ b/mm/swap_slots.c @@ -317,7 +317,7 @@ swp_entry_t get_swap_page(struct page *page) if (PageTransHuge(page)) { if (IS_ENABLED(CONFIG_THP_SWAP)) get_swap_pages(1, true, &entry); - return entry; + goto out; } /* @@ -347,10 +347,14 @@ repeat: } mutex_unlock(&cache->alloc_lock); if (entry.val) - return entry; + goto out; } get_swap_pages(1, false, &entry); - +out: + if (mem_cgroup_try_charge_swap(page, entry)) { + put_swap_page(page, entry); + entry.val = 0; + } return entry; } diff --git a/mm/swap_state.c b/mm/swap_state.c index 07f9aa2340c3..ab8e59cd18ea 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -216,9 +216,6 @@ int add_to_swap(struct page *page) if (!entry.val) return 0; - if (mem_cgroup_try_charge_swap(page, entry)) - goto fail; - /* * Radix-tree node allocations from PF_MEMALLOC contexts could * completely exhaust the page allocator. __GFP_NOMEMALLOC |