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powerpc/pseries/cpuidle: add polling idle for shared processor guests

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For shared processor guests (e.g., KVM), add an idle polling mode rather
than immediately returning to the hypervisor when the guest CPU goes
idle.

Test setup is a 2 socket POWER9 with 4 guests running, each with vCPUs
equal to 1/2 of real of CPUs. Saturated each guest with tbench. Using
polling idle gives about 1.4x throughput.

Kernel compile speed was not changed significantly.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-10-10 17:11:09 +10:00 committed by Michael Ellerman
parent ced54c08d8
commit f2ac428e0e
1 changed files with 8 additions and 2 deletions
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10
drivers/cpuidle/cpuidle-pseries.c
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@ -174,11 +174,17 @@ static struct cpuidle_state dedicated_states[] = {
* States for shared partition case.
*/
static struct cpuidle_state shared_states[] = {
{ /* Snooze */
.name = "snooze",
.desc = "snooze",
.exit_latency = 0,
.target_residency = 0,
.enter = &snooze_loop },
{ /* Shared Cede */
.name = "Shared Cede",
.desc = "Shared Cede",
.exit_latency = 0,
.target_residency = 0,
.exit_latency = 10,
.target_residency = 100,
.enter = &shared_cede_loop },
};