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authorJens Axboe <jens.axboe@oracle.com>2008-01-24 02:44:49 -0500
committerJens Axboe <jens.axboe@oracle.com>2008-01-28 04:50:33 -0500
commit4ac845a2e9a816ed5a7b301f56dcc0a3d0b1ba4d (patch)
tree602f15808d0f3dcdfcd7cc4491b2cc2ccd266fd2 /crypto/cryptomgr.c
parent66dac98ed0de7a1125fb0dd7907f238f6b9d2f60 (diff)
block: cfq: make the io contect sharing lockless
The io context sharing introduced a per-ioc spinlock, that would protect the cfq io context lookup. That is a regression from the original, since we never needed any locking there because the ioc/cic were process private. The cic lookup is changed from an rbtree construct to a radix tree, which we can then use RCU to make the reader side lockless. That is the performance critical path, modifying the radix tree is only done on process creation (when that process first does IO, actually) and on process exit (if that process has done IO). As it so happens, radix trees are also much faster for this type of lookup where the key is a pointer. It's a very sparse tree. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'crypto/cryptomgr.c')
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