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| author | Gautham R. Shenoy <ego@linux.vnet.ibm.com> | 2020-04-07 11:47:42 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-04-30 05:35:26 +0300 |
| commit | 6909f179ca7a73f243dca7c829facca1cc1d4ff5 (patch) | |
| tree | 2a2be960224d06c670e4c3b2d86d669ce1a9ee6e /arch/powerpc/include/asm/idle.h | |
| parent | dc8afce5f45b099e3ea52a16b2f90e92f90f3af0 (diff) | |
| download | linux-6909f179ca7a73f243dca7c829facca1cc1d4ff5.tar.xz | |
powerpc/sysfs: Show idle_purr and idle_spurr for every CPU
On Pseries LPARs, to calculate utilization, we need to know the
[S]PURR ticks when the CPUs were busy or idle.
The total PURR and SPURR ticks are already exposed via the per-cpu
sysfs files "purr" and "spurr". This patch adds support for exposing
the idle PURR and SPURR ticks via new per-cpu sysfs files named
"idle_purr" and "idle_spurr".
This patch also adds helper functions to accurately read the values of
idle_purr and idle_spurr especially from an interrupt context between
when the interrupt has occurred between the pseries_idle_prolog() and
pseries_idle_epilog(). This will ensure that the idle purr/spurr
values corresponding to the latest idle period is accounted for before
these values are read.
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/1586249263-14048-5-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 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/idle.h b/arch/powerpc/include/asm/idle.h index 0efb25071d87..accd1f50085a 100644 --- a/arch/powerpc/include/asm/idle.h +++ b/arch/powerpc/include/asm/idle.h @@ -57,5 +57,37 @@ static inline void pseries_idle_epilog(void) ppc64_runlatch_on(); } +static inline u64 read_this_idle_purr(void) +{ + /* + * If we are reading from an idle context, update the + * idle-purr cycles corresponding to the last idle period. + * Since the idle context is not yet over, take a fresh + * snapshot of the idle-purr. + */ + if (unlikely(get_lppaca()->idle == 1)) { + update_idle_purr_accounting(); + snapshot_purr_idle_entry(); + } + + return be64_to_cpu(get_lppaca()->wait_state_cycles); +} + +static inline u64 read_this_idle_spurr(void) +{ + /* + * If we are reading from an idle context, update the + * idle-spurr cycles corresponding to the last idle period. + * Since the idle context is not yet over, take a fresh + * snapshot of the idle-spurr. + */ + if (get_lppaca()->idle == 1) { + update_idle_spurr_accounting(); + snapshot_spurr_idle_entry(); + } + + return *this_cpu_ptr(&idle_spurr_cycles); +} + #endif /* CONFIG_PPC_PSERIES */ #endif |