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cpus: don't credit executed instructions before they have run

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Outside of the vCPU thread icount time will only be tracked against
timers_state.qemu_icount. We no longer credit cycles until they have
completed the run. Inside the vCPU thread we adjust for passage of
time by looking at how many have run so far. This is only valid inside
the vCPU thread while it is running.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2017-03-31 16:09:42 +01:00
parent 0524838225
commit e4cd96571f
2 changed files with 20 additions and 6 deletions
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25
cpus.c
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@ -223,6 +223,15 @@ void qemu_tcg_configure(QemuOpts *opts, Error **errp)
}
}
/* The current number of executed instructions is based on what we
* originally budgeted minus the current state of the decrementing
* icount counters in extra/u16.low.
*/
static int64_t cpu_get_icount_executed(CPUState *cpu)
{
return cpu->icount_budget - (cpu->icount_decr.u16.low + cpu->icount_extra);
}
int64_t cpu_get_icount_raw(void)
{
int64_t icount;
@ -234,7 +243,8 @@ int64_t cpu_get_icount_raw(void)
fprintf(stderr, "Bad icount read\n");
exit(1);
}
icount -= (cpu->icount_decr.u16.low + cpu->icount_extra);
/* Take into account what has run */
icount += cpu_get_icount_executed(cpu);
}
return icount;
}
@ -1195,7 +1205,10 @@ static void prepare_icount_for_run(CPUState *cpu)
count = tcg_get_icount_limit();
timers_state.qemu_icount += count;
/* To calculate what we have executed so far we need to know
* what we originally budgeted to run this cycle */
cpu->icount_budget = count;
decr = (count > 0xffff) ? 0xffff : count;
count -= decr;
cpu->icount_decr.u16.low = decr;
@ -1206,14 +1219,14 @@ static void prepare_icount_for_run(CPUState *cpu)
static void process_icount_data(CPUState *cpu)
{
if (use_icount) {
/* Fold pending instructions back into the
instruction counter, and clear the interrupt flag. */
timers_state.qemu_icount -= (cpu->icount_decr.u16.low
+ cpu->icount_extra);
/* Account for executed instructions */
timers_state.qemu_icount += cpu_get_icount_executed(cpu);
/* Reset the counters */
cpu->icount_decr.u16.low = 0;
cpu->icount_extra = 0;
cpu->icount_budget = 0;
replay_account_executed_instructions();
}
}

1
include/qom/cpu.h
View File

@ -332,6 +332,7 @@ struct CPUState {
/* updates protected by BQL */
uint32_t interrupt_request;
int singlestep_enabled;
int64_t icount_budget;
int64_t icount_extra;
sigjmp_buf jmp_env;