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| author |   Jeremy Fitzhardinge <jeremy@goop.org> | 2013-08-09 19:51:56 +0530 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@linux.intel.com> | 2013-08-09 07:53:50 -0700 |
| commit | 4a1ed4ca681e7df38ed1b609a11aab38cbc515b3 (patch) | |
| tree | 54206caf9c98f99df114613a160d816e4a08f9e7 /include/linux/jump_label_ratelimit.h | |
| parent | x86, pvticketlock: Use callee-save for lock_spinning (diff) | |
| download | wireguard-linux-4a1ed4ca681e7df38ed1b609a11aab38cbc515b3.tar.xz wireguard-linux-4a1ed4ca681e7df38ed1b609a11aab38cbc515b3.zip | |
x86, pvticketlock: When paravirtualizing ticket locks, increment by 2
Increment ticket head/tails by 2 rather than 1 to leave the LSB free
to store a "is in slowpath state" bit. This halves the number
of possible CPUs for a given ticket size, but this shouldn't matter
in practice - kernels built for 32k+ CPU systems are probably
specially built for the hardware rather than a generic distro
kernel.
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Link: http://lkml.kernel.org/r/1376058122-8248-9-git-send-email-raghavendra.kt@linux.vnet.ibm.com
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Attilio Rao <attilio.rao@citrix.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'include/linux/jump_label_ratelimit.h')
0 files changed, 0 insertions, 0 deletions