|From:||KAMEZAWA Hiroyuki <firstname.lastname@example.org>|
|Subject:||[RFC] [PATCH 0/9] remove page_cgroup pointer (with some enhancements)|
|Date:||Thu, 11 Sep 2008 20:08:55 +0900|
|Cc:||email@example.com, "firstname.lastname@example.org" <email@example.com>, "firstname.lastname@example.org" <email@example.com>, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org|
Hi, Balbir. I wrote remove-page-cgroup-pointer patch on top of my small patches. This series includes enhancements patches for memory resource controller on my queue. I think I can (or have to) do more twaeks but post this while it's hot. Passed some tests. remove-page-cgroup-pointer patch is [8/9] and [9/9]. How about this ? Peformance comparison is below. == rc5-mm1 == Execl Throughput 3006.5 lps (29.8 secs, 3 samples) C Compiler Throughput 1006.7 lpm (60.0 secs, 3 samples) Shell Scripts (1 concurrent) 4863.7 lpm (60.0 secs, 3 samples) Shell Scripts (8 concurrent) 943.7 lpm (60.0 secs, 3 samples) Shell Scripts (16 concurrent) 482.7 lpm (60.0 secs, 3 samples) Dc: sqrt(2) to 99 decimal places 124804.9 lpm (30.0 secs, 3 samples) After this series == Execl Throughput 3003.3 lps (29.8 secs, 3 samples) C Compiler Throughput 1008.0 lpm (60.0 secs, 3 samples) Shell Scripts (1 concurrent) 4580.6 lpm (60.0 secs, 3 samples) Shell Scripts (8 concurrent) 913.3 lpm (60.0 secs, 3 samples) Shell Scripts (16 concurrent) 569.0 lpm (60.0 secs, 3 samples) Dc: sqrt(2) to 99 decimal places 124918.7 lpm (30.0 secs, 3 samples) Hmm..no loss ? But maybe I should find what I can do to improve this. Brief patch description is below. 1. patches/nolimit_root.patch This patch makes 'root' cgroup's limit to be fixed to unlimited. 2. patches/atomic_flags.patch This patch makes page_cgroup->flags to be unsigned long and add atomic ops. 3. patches/account_move.patch This patch implements move_account() function for recharging account from a memory resource controller to another. 4. patches/new_force_empty.patch This patch makes force_empty() to use move_account() rather than just drop accounts. (As fist step, account is moved to 'root'. We can change this later.) 5. patches/make_mapping_null.patch Clean up. This guarantees page->mapping to be NULL before uncharge() against page cache is called. 6. patches/stat.patch Optimize page_cgroup_change_statistics(). 7. patches/charge-will-success.patch Add "likely" to charge function. 8. patches/page_cgroup.patch remove page_cgroup pointer from struct page and add lookup-system for page_cgroup from pfn, 9. patches/boost_page_cgroup_lookupg.patch user per-cpu cache for fast access to page_cgroup. Thanks, -Kame
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