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authorAdhemerval Zanella <azanella@linux.vnet.ibm.com>2013-04-22 09:29:33 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-04-23 16:05:05 +1000
commitfcb41a2030abe0eb716ef0798035ef9562097f42 (patch)
tree4b063cc1cb872fb9609fd90485c7b602b9fdc57f /include/pcmcia/ss.h
parentaf81d7878c641629f2693ae3fdaf74b4af14dfca (diff)
powerpc: Add VDSO version of time
On 04/18/2013 07:38 PM, Anton Blanchard wrote: > Since you are only reading one long you shouldn't need to check the > update count and loop, you will always see a consistent value. The > system call version of time() just does an unprotected load for example. Fixed. > With the above change and with Michael's comments covered (decent > changelog entry and Signed-off-by): > > Acked-by: Anton Blanchard <anton@samba.org> Thanks for the review, below the updated patch: From: Adhemerval Zanella <azanella@linux.vnet.ibm.com> This patch implement the time syscall as vDSO. The performance speedups are: Baseline PPC32: 380 nsec Baseline PPC64: 350 nsec vdso PPC32: 20 nsec vsdo PPC64: 20 nsec Tested on 64 bit build with both 32 bit and 64 bit userland. Acked-by: Anton Blanchard <anton@samba.org> Signed-off-by: Adhemerval Zanella <azanella@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include/pcmcia/ss.h')
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