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authorRik van Riel <riel@redhat.com>2010-04-14 17:59:28 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-04-19 16:28:20 -0700
commite8a03feb54ca7f1768bbdc2b491f9ef654e6d01d (patch)
tree1ce113d18057e0870e0816f272e21b6716ef321f /Makefile
parent9b030e2006546366c832911ca5eb9e785408795b (diff)
rmap: add exclusively owned pages to the newest anon_vma
The recent anon_vma fixes cause many anonymous pages to end up in the parent process anon_vma, even when the page is exclusively owned by the current process. Adding exclusively owned anonymous pages to the top anon_vma reduces rmap scanning overhead, especially in workloads with forking servers. This patch adds a parameter to __page_set_anon_rmap that can be used to indicate whether or not the added page is exclusively owned by the current process. Pages added through page_add_new_anon_rmap are exclusively owned by the current process, and can be added to the top anon_vma. Pages added through page_add_anon_rmap can be either shared or exclusively owned, so we do the conservative thing and add it to the oldest anon_vma. A next step would be to add the exclusive parameter to page_add_anon_rmap, to be used from functions where we do know for sure whether a page is exclusively owned. Signed-off-by: Rik van Riel <riel@redhat.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Lightly-tested-by: Borislav Petkov <bp@alien8.de> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> [ Edited to look nicer - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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