Oh nice, I didn't know that On Tue, Aug 27, 2024, 12:39 Alex Bennée <alex.ben...@linaro.org> wrote:
> Elisha Hollander <just4now666...@gmail.com> writes: > > > Signed-off-by: Elisha Hollander <just4now666...@gmail.com> > > What is the use-case for this patch? > > If you are simply looking to slow the emulated system down please have a > look at: > > > https://qemu.readthedocs.io/en/master/about/emulation.html#limit-instructions-per-second > > which uses the plugin system to limit the run rate and sleep if its > running too fast. The longer term goal is to deprecate the icount clock > alignment feature from the core code and leave icount to just provide > the deterministic execution needed for record/replay and reverse > debugging. > > > > --- > > accel/tcg/cpu-exec.c | 4 +--- > > accel/tcg/icount-common.c | 4 ++-- > > 2 files changed, 3 insertions(+), 5 deletions(-) > > > > diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c > > index 8163295f34..4c2baf8ed4 100644 > > --- a/accel/tcg/cpu-exec.c > > +++ b/accel/tcg/cpu-exec.c > > @@ -95,11 +95,10 @@ static void align_clocks(SyncClocks *sc, CPUState > *cpu) > > static void print_delay(const SyncClocks *sc) > > { > > static float threshold_delay; > > - static int64_t last_realtime_clock; > > static int nb_prints; > > > > if (icount_align_option && > > - sc->realtime_clock - last_realtime_clock >= > MAX_DELAY_PRINT_RATE && > > + sc->diff_clk >= MAX_DELAY_PRINT_RATE && > > nb_prints < MAX_NB_PRINTS) { > > if ((-sc->diff_clk / (float)1000000000LL > threshold_delay) || > > (-sc->diff_clk / (float)1000000000LL < > > @@ -109,7 +108,6 @@ static void print_delay(const SyncClocks *sc) > > threshold_delay - 1, > > threshold_delay); > > nb_prints++; > > - last_realtime_clock = sc->realtime_clock; > > } > > } > > } > > diff --git a/accel/tcg/icount-common.c b/accel/tcg/icount-common.c > > index 8d3d3a7e9d..f07f8baf4d 100644 > > --- a/accel/tcg/icount-common.c > > +++ b/accel/tcg/icount-common.c > > @@ -46,8 +46,8 @@ > > * is TCG-specific, and does not need to be built for other accels. > > */ > > static bool icount_sleep = true; > > -/* Arbitrarily pick 1MIPS as the minimum allowable speed. */ > > -#define MAX_ICOUNT_SHIFT 10 > > +/* Arbitrarily pick the minimum allowable speed. */ > > +#define MAX_ICOUNT_SHIFT 30 > > > > /* Do not count executed instructions */ > > ICountMode use_icount = ICOUNT_DISABLED; > > -- > Alex Bennée > Virtualisation Tech Lead @ Linaro >
