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| author | Gautham R. Shenoy <ego@linux.vnet.ibm.com> | 2020-04-07 14:17:41 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-04-30 12:35:26 +1000 |
| commit | dc8afce5f45b099e3ea52a16b2f90e92f90f3af0 (patch) | |
| tree | 3e9bd15efe196c5fe19ca12060b00d11f9e92539 /arch/powerpc/include/asm/idle.h | |
| parent | c4019198cfa81224d32846915cd401e981f81b81 (diff) | |
| download | linux-dc8afce5f45b099e3ea52a16b2f90e92f90f3af0.tar.bz2 | |
powerpc/pseries: Account for SPURR ticks on idle CPUs
On Pseries LPARs, to calculate utilization, we need to know the
[S]PURR ticks when the CPUs were busy or idle.
Via pseries_idle_prolog(), pseries_idle_epilog(), we track the idle
PURR ticks in the VPA variable "wait_state_cycles". This patch extends
the support to account for the idle SPURR ticks.
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1586249263-14048-4-git-send-email-ego@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/include/asm/idle.h')
| -rw-r--r-- | arch/powerpc/include/asm/idle.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/idle.h b/arch/powerpc/include/asm/idle.h index b90d75aa1f9e..0efb25071d87 100644 --- a/arch/powerpc/include/asm/idle.h +++ b/arch/powerpc/include/asm/idle.h @@ -5,13 +5,20 @@ #include <asm/paca.h> #ifdef CONFIG_PPC_PSERIES +DECLARE_PER_CPU(u64, idle_spurr_cycles); DECLARE_PER_CPU(u64, idle_entry_purr_snap); +DECLARE_PER_CPU(u64, idle_entry_spurr_snap); static inline void snapshot_purr_idle_entry(void) { *this_cpu_ptr(&idle_entry_purr_snap) = mfspr(SPRN_PURR); } +static inline void snapshot_spurr_idle_entry(void) +{ + *this_cpu_ptr(&idle_entry_spurr_snap) = mfspr(SPRN_SPURR); +} + static inline void update_idle_purr_accounting(void) { u64 wait_cycles; @@ -22,10 +29,19 @@ static inline void update_idle_purr_accounting(void) get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles); } +static inline void update_idle_spurr_accounting(void) +{ + u64 *idle_spurr_cycles_ptr = this_cpu_ptr(&idle_spurr_cycles); + u64 in_spurr = *this_cpu_ptr(&idle_entry_spurr_snap); + + *idle_spurr_cycles_ptr += mfspr(SPRN_SPURR) - in_spurr; +} + static inline void pseries_idle_prolog(void) { ppc64_runlatch_off(); snapshot_purr_idle_entry(); + snapshot_spurr_idle_entry(); /* * Indicate to the HV that we are idle. Now would be * a good time to find other work to dispatch. @@ -36,6 +52,7 @@ static inline void pseries_idle_prolog(void) static inline void pseries_idle_epilog(void) { update_idle_purr_accounting(); + update_idle_spurr_accounting(); get_lppaca()->idle = 0; ppc64_runlatch_on(); } |