| Re: [PATCH 8/8] Per-container pages reclamation [message #12297 is a reply to message #12287] |
Tue, 24 April 2007 11:01   |
Balbir Singh
Messages: 491
Registered: August 2006
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Senior Member |
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Pavel Emelianov wrote:
> Balbir Singh wrote:
>> Pavel Emelianov wrote:
>>> Implement try_to_free_pages_in_container() to free the
>>> pages in container that has run out of memory.
>>>
>>> The scan_control->isolate_pages() function isolates the
>>> container pages only.
>>>
>> Pavel,
>>
>> I've just started playing around with these patches, I preferred
>> the approach of v1. Please see below
>>
>>> +static unsigned long isolate_container_pages(unsigned long nr_to_scan,
>>> + struct list_head *src, struct list_head *dst,
>>> + unsigned long *scanned, struct zone *zone)
>>> +{
>>> + unsigned long nr_taken = 0;
>>> + struct page *page;
>>> + struct page_container *pc;
>>> + unsigned long scan;
>>> + LIST_HEAD(pc_list);
>>> +
>>> + for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
>>> + pc = list_entry(src->prev, struct page_container, list);
>>> + page = pc->page;
>>> + if (page_zone(page) != zone)
>>> + continue;
>> shrink_zone() will walk all pages looking for pages belonging to this
>
> No. shrink_zone() will walk container pages looking for pages in the desired zone.
> Scann through the full zone is done on global memory shortage.
>
Yes, I see that now. But for each zone in the system, we walk through the
containers list - right?
I have some more fixes, improvements that I want to send across.
I'll start sending them out to you as I test and verify them.
>> container and this slows down the reclaim quite a bit. Although we've
>> reused code, we've ended up walking the entire list of the zone to
>> find pages belonging to a particular container, this was the same
>> problem I had with my RSS controller patches.
>>
>>> +
>>> + list_move(&pc->list, &pc_list);
>>> +
>>
>
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
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