VM: Manual and Automatic page cache reclaim
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Cover letter [PATCH/RFC 0/4] VM: Manual and Automatic page cache reclaim
Hi,
The following set of patches is response to the first round of comments that were sent out in February
http://marc.theaimsgroup.com/?l=linux-kernel&m=110839604924587&w=2
The consensus of this thread was that manual reclaim should happen through a syscall and be per-node, and that automatic reclaim should probably happen through mempolicy hints.
This set is against 2.6.12-rc2-mm2 (sorry for not being against -mm3. It doesn't boot correctly on Altix)
The patches introduce two different ways to free up page cache from a
node: manually through a syscall and automatically through flag modifiers to a mempolicy.
Currently if a job is started and there is page cache lying around on a particular node then allocations will spill onto remote nodes and page cache won't be reclaimed until the whole system is short on memory. This can result in a signficiant performance hit for HPC applications that planned on that memory being allocated locally.
Here's a little summary of the pages in the set:
1/4: Merge LRU pages
This is the opposite of isolate_lru_pages(). It merges pages from a list back onto the appropriate LRU lists.
2/4: Local reclaim core
The reclaim code. It extends shrink_list() so it can be used to scan the active list as well. The core of all of this is reclaim_clean_pages(). It tries to remove a specified number of pages from a zone's cache. It does this without swapping or doing writebacks. The goal here is to free easily freeable pages.
3/4: toss_page_cache_node() syscall
This adds the manual reclaim method via a syscall.
4/4: localreclaim flags for mempolicies
Adds a flags argument to set_mempolicy() and add a new mempolicy.
mh
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Martin Hicks || Silicon Graphics Inc. || [email protected] -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to [email protected]. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"[email protected]"> [email protected] </a>