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| author |   Michael Neuling <mikey@neuling.org> | 2014-06-11 15:59:28 +1000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-06-11 17:05:12 +1000 |
| commit | d4e58e5928f8c6c49228451dd03e0714cbab299a (patch) | |
| tree | 34add9a16b4dbe03da04191f51588f3f6a6bdbf9 /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | powerpc/cpuidle: Only clear LPCR decrementer wakeup bit on fast sleep entry (diff) | |
| download | wireguard-linux-d4e58e5928f8c6c49228451dd03e0714cbab299a.tar.xz wireguard-linux-d4e58e5928f8c6c49228451dd03e0714cbab299a.zip | |
powerpc/powernv: Enable POWER8 doorbell IPIs
This patch enables POWER8 doorbell IPIs on powernv.
Since doorbells can only IPI within a core, we test to see when we can use
doorbells and if not we fall back to XICS. This also enables hypervisor
doorbells to wakeup us up from nap/sleep via the LPCR PECEDH bit.
Based on tests by Anton, the best case IPI latency between two threads dropped
from 894ns to 512ns.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions