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| author | Leandro Lupori <leandro.lupori@eldorado.org.br> | 2022-10-25 17:24:24 -0300 |
|---|---|---|
| committer | Daniel Henrique Barboza <danielhb413@gmail.com> | 2022-10-28 13:15:23 -0300 |
| commit | eeaaefe9fa8b95a7ed39ee86257f3bf1af751804 (patch) | |
| tree | 68aae0fe616f09eb7060a4573a6069307bd34957 /target/ppc/power8-pmu.h | |
| parent | 8b3d1c49a9f0f315d2b292c1791430c0f382afa4 (diff) | |
| download | qemu-eeaaefe9fa8b95a7ed39ee86257f3bf1af751804.zip qemu-eeaaefe9fa8b95a7ed39ee86257f3bf1af751804.tar.gz qemu-eeaaefe9fa8b95a7ed39ee86257f3bf1af751804.tar.bz2 | |
target/ppc: Increment PMC5 with inline insns
Profiling QEMU during Fedora 35 for PPC64 boot revealed that
6.39% of total time was being spent in helper_insns_inc(), on a
POWER9 machine. To avoid calling this helper every time PMCs had
to be incremented, an inline implementation of PMC5 increment and
check for overflow was developed. This led to a reduction of
about 12% in Fedora's boot time.
Signed-off-by: Leandro Lupori <leandro.lupori@eldorado.org.br>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20221025202424.195984-4-leandro.lupori@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Diffstat (limited to 'target/ppc/power8-pmu.h')
| -rw-r--r-- | target/ppc/power8-pmu.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/target/ppc/power8-pmu.h b/target/ppc/power8-pmu.h index 9692dd7..c0093e2 100644 --- a/target/ppc/power8-pmu.h +++ b/target/ppc/power8-pmu.h @@ -14,6 +14,9 @@ #define POWER8_PMU_H #if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) + +#define PMC_COUNTER_NEGATIVE_VAL 0x80000000UL + void cpu_ppc_pmu_init(CPUPPCState *env); void pmu_update_summaries(CPUPPCState *env); #else |