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Date: Sat, 7 Feb 2009 02:15:21 +0900
From: MinChan Kim <minchan.kim@...il.com>
To: Johannes Weiner <hannes@...xchg.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Rafael J. Wysocki" <rjw@...k.pl>, Rik van Riel <riel@...hat.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/3][RFC] swsusp: shrink file cache first
>>> Grr, you are right.
>>> I agree, currently may_swap doesn't control swap out or not.
>>> so I think we should change it correct name ;)
>>
>> Agreed. What do you think about the following patch?
>
> As for me, I can't agree with you.
> There are two kinds of file-mapped pages.
>
> 1. file-mapped and dirty page.
> 2. file-mapped and no-dirty page
>
> Both pages are not swapped.
> File-mapped and dirty page is synced with original file
> File-mapped and no-dirty page is just discarded with viewpoint of reclaim.
>
> So, may_swap is just related to anon-pages
> Thus, I think may_swap is reasonable.
> How about you ?
Sorry for misunderstood your point.
It would be better to remain more detaily for git log ?
'may_swap' applies not only to anon pages but to mapped file pages as
well. 'may_swap' term is sometime used for 'swap', sometime used for
'sync|discard'.
In case of anon pages, 'may_swap' determines whether pages were swapout or not.
but In case of mapped file pages, it determines whether pages are
synced or discarded. so, 'may_swap' is rather awkward. Rename it to
'may_unmap' which is the actual meaning.
If you find wrong word and sentence, Please, fix it. :)
>
>>
>> ---
>> Subject: vmscan: rename may_swap scan control knob
>>
>> may_swap applies not only to anon pages but to mapped file pages as
>> well. Rename it to may_unmap which is the actual meaning.
>>
>> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
>> ---
>>
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index 9a27c44..2523600 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -60,8 +60,8 @@ struct scan_control {
>>
>> int may_writepage;
>>
>> - /* Can pages be swapped as part of reclaim? */
>> - int may_swap;
>> + /* Reclaim mapped pages */
>> + int may_unmap;
>>
>> /* This context's SWAP_CLUSTER_MAX. If freeing memory for
>> * suspend, we effectively ignore SWAP_CLUSTER_MAX.
>> @@ -606,7 +606,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>> if (unlikely(!page_evictable(page, NULL)))
>> goto cull_mlocked;
>>
>> - if (!sc->may_swap && page_mapped(page))
>> + if (!sc->may_unmap && page_mapped(page))
>> goto keep_locked;
>>
>> /* Double the slab pressure for mapped and swapcache pages */
>> @@ -1694,7 +1694,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
>> .gfp_mask = gfp_mask,
>> .may_writepage = !laptop_mode,
>> .swap_cluster_max = SWAP_CLUSTER_MAX,
>> - .may_swap = 1,
>> + .may_unmap = 1,
>> .swappiness = vm_swappiness,
>> .order = order,
>> .mem_cgroup = NULL,
>> @@ -1713,7 +1713,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
>> {
>> struct scan_control sc = {
>> .may_writepage = !laptop_mode,
>> - .may_swap = 1,
>> + .may_unmap = 1,
>> .swap_cluster_max = SWAP_CLUSTER_MAX,
>> .swappiness = swappiness,
>> .order = 0,
>> @@ -1723,7 +1723,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
>> struct zonelist *zonelist;
>>
>> if (noswap)
>> - sc.may_swap = 0;
>> + sc.may_unmap = 0;
>>
>> sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
>> (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
>> @@ -1762,7 +1762,7 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
>> struct reclaim_state *reclaim_state = current->reclaim_state;
>> struct scan_control sc = {
>> .gfp_mask = GFP_KERNEL,
>> - .may_swap = 1,
>> + .may_unmap = 1,
>> .swap_cluster_max = SWAP_CLUSTER_MAX,
>> .swappiness = vm_swappiness,
>> .order = order,
>> @@ -2109,7 +2109,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
>> struct reclaim_state reclaim_state;
>> struct scan_control sc = {
>> .gfp_mask = GFP_KERNEL,
>> - .may_swap = 0,
>> + .may_unmap = 0,
>> .swap_cluster_max = nr_pages,
>> .may_writepage = 1,
>> .swappiness = vm_swappiness,
>> @@ -2147,7 +2147,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
>>
>> /* Force reclaiming mapped pages in the passes #3 and #4 */
>> if (pass > 2) {
>> - sc.may_swap = 1;
>> + sc.may_unmap = 1;
>> sc.swappiness = 100;
>> }
>>
>> @@ -2292,7 +2292,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
>> int priority;
>> struct scan_control sc = {
>> .may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
>> - .may_swap = !!(zone_reclaim_mode & RECLAIM_SWAP),
>> + .may_unmap = !!(zone_reclaim_mode & RECLAIM_SWAP),
>> .swap_cluster_max = max_t(unsigned long, nr_pages,
>> SWAP_CLUSTER_MAX),
>> .gfp_mask = gfp_mask,
>>
>> --
>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
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>> see: http://www.linux-mm.org/ .
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>>
>
>
>
> --
> Kinds regards,
> MinChan Kim
>
--
Kinds regards,
MinChan Kim
--
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