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(parent: ff0c7d1) | patch
kernel: optimise seqlock
authorNick Piggin <npiggin@kernel.dk>
Fri, 7 Jan 2011 06:49:51 +0000 (17:49 +1100)
committerNick Piggin <npiggin@kernel.dk>
Fri, 7 Jan 2011 06:50:27 +0000 (17:50 +1100)
commit3c22cd5709e8143444a6d08682a87f4c57902df3
tree6d245491d9103a1d77a3128ed5d1d996d3794300tree | snapshot
parentff0c7d15f9787b7e8c601533c015295cc68329f8commit | diff
kernel: optimise seqlock

Add branch annotations for seqlock read fastpath, and introduce
__read_seqcount_begin and __read_seqcount_end functions, that can avoid the
smp_rmb() if used carefully. These will be used by store-free path walking
algorithm performance is critical and seqlocks are in use.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
include/linux/seqlock.h diff | blob | history
Port of xen3.3 xenlinux code to Ubuntu Natty kernel