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| author | Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru> | 2020-12-08 12:10:58 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-12-15 12:52:04 -0500 |
| commit | 835cbd8d44b62217b8774b39e1bfd314750c2c51 (patch) | |
| tree | dc14acd026d3904b096b646895566d2964dc229d | |
| parent | 90d6a086bb220bcd8b2ba3c881ac53862caa4987 (diff) | |
| download | qemu-835cbd8d44b62217b8774b39e1bfd314750c2c51.zip qemu-835cbd8d44b62217b8774b39e1bfd314750c2c51.tar.gz qemu-835cbd8d44b62217b8774b39e1bfd314750c2c51.tar.bz2 | |
icount: improve exec nocache usage
cpu-exec tries to execute TB without caching when current
icount budget is over. But sometimes refilled budget is big
enough to try executing cached blocks.
This patch checks that instruction budget is big enough
for next block execution instead of just running cpu_exec_nocache.
It halves the number of calls of cpu_exec_nocache function
during tested OS boot scenario.
Signed-off-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>
Message-Id: <160741865825.348476.7169239332367828943.stgit@pasha-ThinkPad-X280>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | accel/tcg/cpu-exec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index 58aea60..251b340 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -685,7 +685,7 @@ static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb, insns_left = MIN(0xffff, cpu->icount_budget); cpu_neg(cpu)->icount_decr.u16.low = insns_left; cpu->icount_extra = cpu->icount_budget - insns_left; - if (!cpu->icount_extra) { + if (!cpu->icount_extra && insns_left < tb->icount) { /* Execute any remaining instructions, then let the main loop * handle the next event. */ |