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Commit 6abb5a86 authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

mm: memcontrol: avoid charge statistics churn during page migration 



Charge migration currently disables IRQs twice to update the charge
statistics for the old page and then again for the new page.

But migration is a seamless transition of a charge from one physical
page to another one of the same size, so this should be a non-event from
an accounting point of view.  Leave the statistics alone.

Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3cbb0187

mm/memcontrol.c

+10 −25
Original line number Diff line number Diff line
@@ -2728,7 +2728,7 @@ static void unlock_page_lru(struct page *page, int isolated) 
}



static void commit_charge(struct page *page, struct mem_cgroup *memcg,

			  unsigned int nr_pages, bool lrucare)

			  bool lrucare)

{

	struct page_cgroup *pc = lookup_page_cgroup(page);

	int isolated;
@@ -2765,16 +2765,6 @@ static void commit_charge(struct page *page, struct mem_cgroup *memcg, 


	if (lrucare)

		unlock_page_lru(page, isolated);



	local_irq_disable();

	mem_cgroup_charge_statistics(memcg, page, nr_pages);

	/*

	 * "charge_statistics" updated event counter. Then, check it.

	 * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.

	 * if they exceeds softlimit.

	 */

	memcg_check_events(memcg, page);

	local_irq_enable();

}



static DEFINE_MUTEX(set_limit_mutex);
@@ -6460,12 +6450,17 @@ void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, 
	if (!memcg)

		return;



	commit_charge(page, memcg, lrucare);



	if (PageTransHuge(page)) {

		nr_pages <<= compound_order(page);

		VM_BUG_ON_PAGE(!PageTransHuge(page), page);

	}



	commit_charge(page, memcg, nr_pages, lrucare);

	local_irq_disable();

	mem_cgroup_charge_statistics(memcg, page, nr_pages);

	memcg_check_events(memcg, page);

	local_irq_enable();



	if (do_swap_account && PageSwapCache(page)) {

		swp_entry_t entry = { .val = page_private(page) };
@@ -6651,7 +6646,6 @@ void mem_cgroup_uncharge_list(struct list_head *page_list) 
void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,

			bool lrucare)

{

	unsigned int nr_pages = 1;

	struct page_cgroup *pc;

	int isolated;
@@ -6660,6 +6654,8 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, 
	VM_BUG_ON_PAGE(!lrucare && PageLRU(oldpage), oldpage);

	VM_BUG_ON_PAGE(!lrucare && PageLRU(newpage), newpage);

	VM_BUG_ON_PAGE(PageAnon(oldpage) != PageAnon(newpage), newpage);

	VM_BUG_ON_PAGE(PageTransHuge(oldpage) != PageTransHuge(newpage),

		       newpage);



	if (mem_cgroup_disabled())

		return;
@@ -6677,12 +6673,6 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, 
	VM_BUG_ON_PAGE(!(pc->flags & PCG_MEM), oldpage);

	VM_BUG_ON_PAGE(do_swap_account && !(pc->flags & PCG_MEMSW), oldpage);



	if (PageTransHuge(oldpage)) {

		nr_pages <<= compound_order(oldpage);

		VM_BUG_ON_PAGE(!PageTransHuge(oldpage), oldpage);

		VM_BUG_ON_PAGE(!PageTransHuge(newpage), newpage);

	}



	if (lrucare)

		lock_page_lru(oldpage, &isolated);
@@ -6691,12 +6681,7 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, 
	if (lrucare)

		unlock_page_lru(oldpage, isolated);



	local_irq_disable();

	mem_cgroup_charge_statistics(pc->mem_cgroup, oldpage, -nr_pages);

	memcg_check_events(pc->mem_cgroup, oldpage);

	local_irq_enable();



	commit_charge(newpage, pc->mem_cgroup, nr_pages, lrucare);

	commit_charge(newpage, pc->mem_cgroup, lrucare);

}



/*