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| author | Nick Piggin <npiggin@suse.de> | 2008-07-25 19:45:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-26 12:00:06 -0700 |
| commit | a60637c85893e7191faaafa6a72e197c24386727 (patch) | |
| tree | fa3ec63f505e64d3b4a2be4efd9a5314ab5f6234 /mm/page-writeback.c | |
| parent | e286781d5f2e9c846e012a39653a166e9d31777d (diff) | |
| download | op-kernel-dev-a60637c85893e7191faaafa6a72e197c24386727.zip op-kernel-dev-a60637c85893e7191faaafa6a72e197c24386727.tar.gz | |
mm: lockless pagecache
Combine page_cache_get_speculative with lockless radix tree lookups to
introduce lockless page cache lookups (ie. no mapping->tree_lock on the
read-side).
The only atomicity changes this introduces is that the gang pagecache
lookup functions now behave as if they are implemented with multiple
find_get_page calls, rather than operating on a snapshot of the pages. In
practice, this atomicity guarantee is not used anyway, and it is to
replace individual lookups, so these semantics are natural.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page-writeback.c')
0 files changed, 0 insertions, 0 deletions
