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authorChristian Ehrhardt <ehrhardt@de.ibm.com>2006-03-09 17:33:49 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-09 19:47:38 -0800
commit96567161de0ceed45cd2eb0e5380e3c797f5c0f4 (patch)
treeeb1cf052c95b95052e281f9a0d33ea025ce39dc5 /drivers/edac
parent6a88231fc7da311e4da4ce2011d1a132c80c145a (diff)
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[PATCH] s390: Increase spinlock retry code performance
Currently the code tries up to spin_retry times to grab a lock using the cs instruction. The cs instruction has exclusive access to a memory region and therefore invalidates the appropiate cache line of all other cpus. If there is contention on a lock this leads to cache line trashing. This can be avoided if we first check wether a cs instruction is likely to succeed before the instruction gets actually executed. Signed-off-by: Christian Ehrhardt <ehrhardt@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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