diff options
| author | dp-arm <dimitris.papastamos@arm.com> | 2016-11-15 13:25:30 +0000 |
|---|---|---|
| committer | dp-arm <dimitris.papastamos@arm.com> | 2016-12-14 09:53:14 +0000 |
| commit | 7941816a3428f015a9f4a6c5dc978b4fca568f4b (patch) | |
| tree | 0d25b1c07ffb685ec4f2de561ccb44e76337b2b4 /lib/psci/psci_off.c | |
| parent | 1b5fa6ef1082ffb9979df4aad91525eda571eb50 (diff) | |
Add two timestamps to measure PSCI cache flush overhead
Testing showed that the time spent in a cluster power down
operation is dominated by cache flushes. Add two more timestamps
in runtime instrumentation to keep track of the time spent
flushing the L1/L2 caches.
Change-Id: I4c5a04e7663543225a85d3c6b271d7b706deffc4
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
Diffstat (limited to 'lib/psci/psci_off.c')
| -rw-r--r-- | lib/psci/psci_off.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/psci/psci_off.c b/lib/psci/psci_off.c index 1cc6ede3..897bf319 100644 --- a/lib/psci/psci_off.c +++ b/lib/psci/psci_off.c @@ -107,12 +107,29 @@ int psci_do_cpu_off(unsigned int end_pwrlvl) psci_stats_update_pwr_down(end_pwrlvl, &state_info); #endif +#if ENABLE_RUNTIME_INSTRUMENTATION + + /* + * Flush cache line so that even if CPU power down happens + * the timestamp update is reflected in memory. + */ + PMF_CAPTURE_TIMESTAMP(rt_instr_svc, + RT_INSTR_ENTER_CFLUSH, + PMF_CACHE_MAINT); +#endif + /* * Arch. management. Perform the necessary steps to flush all * cpu caches. */ psci_do_pwrdown_cache_maintenance(psci_find_max_off_lvl(&state_info)); +#if ENABLE_RUNTIME_INSTRUMENTATION + PMF_CAPTURE_TIMESTAMP(rt_instr_svc, + RT_INSTR_EXIT_CFLUSH, + PMF_NO_CACHE_MAINT); +#endif + /* * Plat. management: Perform platform specific actions to turn this * cpu off e.g. exit cpu coherency, program the power controller etc. |