The patch titled
Subject: mm: free swap cache aggressively if memcg swap is full
has been removed from the -mm tree. Its filename was
mm-free-swap-cache-aggressively-if-memcg-swap-is-full.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: mm: free swap cache aggressively if memcg swap is full
Swap cache pages are freed aggressively if swap is nearly full (>50%
currently), because otherwise we are likely to stop scanning anonymous
when we near the swap limit even if there is plenty of freeable swap cache
pages. We should follow the same trend in case of memory cgroup, which
has its own swap limit.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/swap.h | 6 ++++++
mm/memcontrol.c | 22 ++++++++++++++++++++++
mm/memory.c | 3 ++-
mm/swapfile.c | 2 +-
mm/vmscan.c | 2 +-
5 files changed, 32 insertions(+), 3 deletions(-)
diff -puN include/linux/swap.h~mm-free-swap-cache-aggressively-if-memcg-swap-is-full include/linux/swap.h
--- a/include/linux/swap.h~mm-free-swap-cache-aggressively-if-memcg-swap-is-full
+++ a/include/linux/swap.h
@@ -552,6 +552,7 @@ extern void mem_cgroup_swapout(struct pa
extern int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry);
extern void mem_cgroup_uncharge_swap(swp_entry_t entry);
extern long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg);
+extern bool mem_cgroup_swap_full(struct page *page);
#else
static inline void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
{
@@ -571,6 +572,11 @@ static inline long mem_cgroup_get_nr_swa
{
return get_nr_swap_pages();
}
+
+static inline bool mem_cgroup_swap_full(struct page *page)
+{
+ return vm_swap_full();
+}
#endif
#endif /* __KERNEL__*/
diff -puN mm/memcontrol.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full mm/memcontrol.c
--- a/mm/memcontrol.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full
+++ a/mm/memcontrol.c
@@ -5761,6 +5761,28 @@ long mem_cgroup_get_nr_swap_pages(struct
return nr_swap_pages;
}
+bool mem_cgroup_swap_full(struct page *page)
+{
+ struct mem_cgroup *memcg;
+
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+
+ if (vm_swap_full())
+ return true;
+ if (!do_swap_account || !cgroup_subsys_on_dfl(memory_cgrp_subsys))
+ return false;
+
+ memcg = page->mem_cgroup;
+ if (!memcg)
+ return false;
+
+ for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg))
+ if (page_counter_read(&memcg->swap) * 2 >= memcg->swap.limit)
+ return true;
+
+ return false;
+}
+
/* for remember boot option*/
#ifdef CONFIG_MEMCG_SWAP_ENABLED
static int really_do_swap_account __initdata = 1;
diff -puN mm/memory.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full mm/memory.c
--- a/mm/memory.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full
+++ a/mm/memory.c
@@ -2582,7 +2582,8 @@ static int do_swap_page(struct mm_struct
}
swap_free(entry);
- if (vm_swap_full() || (vma->vm_flags & VM_LOCKED) || PageMlocked(page))
+ if (mem_cgroup_swap_full(page) ||
+ (vma->vm_flags & VM_LOCKED) || PageMlocked(page))
try_to_free_swap(page);
unlock_page(page);
if (page != swapcache) {
diff -puN mm/swapfile.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full mm/swapfile.c
--- a/mm/swapfile.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full
+++ a/mm/swapfile.c
@@ -1006,7 +1006,7 @@ int free_swap_and_cache(swp_entry_t entr
* Also recheck PageSwapCache now page is locked (above).
*/
if (PageSwapCache(page) && !PageWriteback(page) &&
- (!page_mapped(page) || vm_swap_full())) {
+ (!page_mapped(page) || mem_cgroup_swap_full(page))) {
delete_from_swap_cache(page);
SetPageDirty(page);
}
diff -puN mm/vmscan.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full mm/vmscan.c
--- a/mm/vmscan.c~mm-free-swap-cache-aggressively-if-memcg-swap-is-full
+++ a/mm/vmscan.c
@@ -1214,7 +1214,7 @@ cull_mlocked:
activate_locked:
/* Not a candidate for swapping, so reclaim swap space. */
- if (PageSwapCache(page) && vm_swap_full())
+ if (PageSwapCache(page) && mem_cgroup_swap_full(page))
try_to_free_swap(page);
VM_BUG_ON_PAGE(PageActive(page), page);
SetPageActive(page);
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
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