Messages in this thread | | | Date | Fri, 11 Dec 2015 14:33:58 -0500 | From | Johannes Weiner <> | Subject | Re: [PATCH 6/7] mm: free swap cache aggressively if memcg swap is full |
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On Thu, Dec 10, 2015 at 02:39:19PM +0300, Vladimir Davydov wrote: > 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@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
One note:
> @@ -5839,6 +5839,29 @@ 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 || !PageSwapCache(page)) > + return false;
The callers establish PageSwapCache() under the page lock, which makes sense since they only inquire about the swap state when deciding what to do with a swapcache page at hand. So this check seems unnecessary.
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