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Commit 5ccc5aba authored by Vladimir Davydov's avatar Vladimir Davydov Committed by Linus Torvalds
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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: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d8b38438

include/linux/swap.h

+6 −0
Original line number Diff line number Diff line
@@ -552,6 +552,7 @@ extern void mem_cgroup_swapout(struct page *page, swp_entry_t entry); 
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_swap_pages(struct mem_cgroup *memcg) 
{

	return get_nr_swap_pages();

}



static inline bool mem_cgroup_swap_full(struct page *page)

{

	return vm_swap_full();

}

#endif



#endif /* __KERNEL__*/

mm/memcontrol.c

+22 −0
Original line number Diff line number Diff line
@@ -5761,6 +5761,28 @@ long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg) 
	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;

mm/memory.c

+2 −1
Original line number Diff line number Diff line
@@ -2582,7 +2582,8 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, 
	}



	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) {

mm/swapfile.c

+1 −1
Original line number Diff line number Diff line
@@ -1006,7 +1006,7 @@ int free_swap_and_cache(swp_entry_t entry) 
		 * 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);

		}

mm/vmscan.c

+1 −1
Original line number Diff line number Diff line
@@ -1214,7 +1214,7 @@ static unsigned long shrink_page_list(struct list_head *page_list, 


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);