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contrib/plugins: allow setting of instructions per quantum

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The default is we update time every 1/10th of a second or so. However
for some cases we might want to update time more frequently. Allow
this to be set via the command line through the ipq argument.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250603110204.838117-7-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2025-06-03 12:01:53 +01:00
parent 0dd99ef250
commit 002655381f
2 changed files with 18 additions and 1 deletions
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15
contrib/plugins/ips.c
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@ -145,6 +145,8 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info, int argc,
char **argv)
{
bool ipq_set = false;
for (int i = 0; i < argc; i++) {
char *opt = argv[i];
g_auto(GStrv) tokens = g_strsplit(opt, "=", 2);
@ -175,6 +177,14 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
return -1;
}
}
} else if (g_strcmp0(tokens[0], "ipq") == 0) {
max_insn_per_quantum = g_ascii_strtoull(tokens[1], NULL, 10);
if (!max_insn_per_quantum) {
fprintf(stderr, "bad ipq value: %s\n", tokens[0]);
return -1;
}
ipq_set = true;
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
@ -182,7 +192,10 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
}
vcpus = qemu_plugin_scoreboard_new(sizeof(vCPUTime));
max_insn_per_quantum = max_insn_per_second / NUM_TIME_UPDATE_PER_SEC;
if (!ipq_set) {
max_insn_per_quantum = max_insn_per_second / NUM_TIME_UPDATE_PER_SEC;
}
if (max_insn_per_quantum == 0) {
fprintf(stderr, "minimum of %d instructions per second needed\n",