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authorGautham R. Shenoy <ego@linux.vnet.ibm.com>2020-04-07 11:47:42 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2020-04-30 05:35:26 +0300
commit6909f179ca7a73f243dca7c829facca1cc1d4ff5 (patch)
tree2a2be960224d06c670e4c3b2d86d669ce1a9ee6e /arch/powerpc/include/asm/idle.h
parentdc8afce5f45b099e3ea52a16b2f90e92f90f3af0 (diff)
downloadlinux-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.h32
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