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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC v2 4/4] xl: introduce rt scheduler
Add xl command for rt scheduler
Signed-off-by: Sisu Xi <xisisu@xxxxxxxxx>
Signed-off-by: Meng Xu <mengxu@xxxxxxxxxxxxx>
---
docs/man/xl.pod.1 | 40 ++++++++++++++
tools/libxl/xl.h | 1 +
tools/libxl/xl_cmdimpl.c | 131 +++++++++++++++++++++++++++++++++++++++++++++
tools/libxl/xl_cmdtable.c | 9 ++++
4 files changed, 181 insertions(+)
diff --git a/docs/man/xl.pod.1 b/docs/man/xl.pod.1
index 30bd4bf..42aeedc 100644
--- a/docs/man/xl.pod.1
+++ b/docs/man/xl.pod.1
@@ -1019,6 +1019,46 @@ Restrict output to domains in the specified cpupool.
=back
+=item B<sched-rt> [I<OPTIONS>]
+
+Set or get rt (Real Time) scheduler parameters. This rt scheduler applies
+Preemptive Global Earliest Deadline First real-time scheduling algorithm to
+schedule VCPUs in the system. Each VCPU has a dedicated period and budget.
+While scheduled, a VCPU burns its budget.
+A VCPU has its budget replenished at the beginning of each of its periods;
+The VCPU discards its unused budget at the end of its periods.
+
+B<OPTIONS>
+
+=over 4
+
+=item B<-d DOMAIN>, B<--domain=DOMAIN>
+
+Specify domain for which scheduler parameters are to be modified or retrieved.
+Mandatory for modifying scheduler parameters.
+
+=item B<-v VCPU>, B<--vcpu=VCPU>
+
+Specify the index of VCPU whose parameters will be set.
+A domain can have multiple VCPUs; Each VCPU has a unique index in this domain;
+When set domain's parameters, it needs to set each VCPU's parameters of this
+domain.
+
+=item B<-p PERIOD>, B<--period=PERIOD>
+
+A VCPU replenish its budget in every period. Time unit is millisecond.
+
+=item B<-b BUDGET>, B<--budget=BUDGET>
+
+A VCPU has BUDGET amount of time to run for each period.
+Time unit is millisecond.
+
+=item B<-c CPUPOOL>, B<--cpupool=CPUPOOL>
+
+Restrict output to domains in the specified cpupool.
+
+=back
+
=back
=head1 CPUPOOLS COMMANDS
diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
index 10a2e66..51b634a 100644
--- a/tools/libxl/xl.h
+++ b/tools/libxl/xl.h
@@ -67,6 +67,7 @@ int main_memset(int argc, char **argv);
int main_sched_credit(int argc, char **argv);
int main_sched_credit2(int argc, char **argv);
int main_sched_sedf(int argc, char **argv);
+int main_sched_rt(int argc, char **argv);
int main_domid(int argc, char **argv);
int main_domname(int argc, char **argv);
int main_rename(int argc, char **argv);
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 01bce2f..eb0039f 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5100,6 +5100,52 @@ static int sched_sedf_domain_output(
return 0;
}
+
+static int sched_rt_domain_output(
+ int domid)
+{
+ char *domname;
+ libxl_domain_sched_params scinfo;
+ int rc = 0, i;
+
+ if (domid < 0) {
+ printf("%-33s %4s %4s %9s %9s\n", "Name", "ID", "VCPU", "Period",
"Budget");
+ return 0;
+ }
+
+ libxl_domain_sched_params_init(&scinfo);
+ rc = sched_domain_get(LIBXL_SCHEDULER_RT, domid, &scinfo);
+ if (rc)
+ goto out;
+
+ domname = libxl_domid_to_name(ctx, domid);
+ for( i = 0; i < scinfo.rt.num_vcpus; i++ )
+ {
+ printf("%-33s %4d %4d %9"PRIu64" %9"PRIu64"\n",
+ domname,
+ domid,
+ scinfo.rt.vcpus[i].index,
+ scinfo.rt.vcpus[i].period,
+ scinfo.rt.vcpus[i].budget);
+ }
+ free(domname);
+
+out:
+ libxl_domain_sched_params_dispose(&scinfo);
+ return rc;
+}
+
+static int sched_rt_pool_output(uint32_t poolid)
+{
+ char *poolname;
+
+ poolname = libxl_cpupoolid_to_name(ctx, poolid);
+ printf("Cpupool %s: sched=EDF\n", poolname);
+
+ free(poolname);
+ return 0;
+}
+
static int sched_default_pool_output(uint32_t poolid)
{
char *poolname;
@@ -5467,6 +5513,91 @@ int main_sched_sedf(int argc, char **argv)
return 0;
}
+/*
+ * <nothing> : List all domain paramters and sched params
+ * -d [domid] : List domain params for domain
+ * -d [domid] [params] : Set domain params for domain
+ */
+int main_sched_rt(int argc, char **argv)
+{
+ const char *dom = NULL;
+ const char *cpupool = NULL;
+ int period = 10, opt_p = 0;
+ int budget = 4, opt_b = 0;
+ int vcpu_index = 0, opt_v = 0;
+ int opt, rc;
+ static struct option opts[] = {
+ {"domain", 1, 0, 'd'},
+ {"period", 1, 0, 'p'},
+ {"budget", 1, 0, 'b'},
+ {"vcpu", 1, 0, 'v'},
+ {"cpupool", 1, 0, 'c'},
+ COMMON_LONG_OPTS,
+ {0, 0, 0, 0}
+ };
+
+ SWITCH_FOREACH_OPT(opt, "d:p:b:v:c:h", opts, "sched-rt", 0) {
+ case 'd':
+ dom = optarg;
+ break;
+ case 'p':
+ period = strtol(optarg, NULL, 10);
+ opt_p = 1;
+ break;
+ case 'b':
+ budget = strtol(optarg, NULL, 10);
+ opt_b = 1;
+ break;
+ case 'v':
+ vcpu_index = strtol(optarg, NULL, 10);
+ opt_v = 1;
+ break;
+ case 'c':
+ cpupool = optarg;
+ break;
+ }
+
+ if (cpupool && (dom || opt_p || opt_b || opt_v)) {
+ fprintf(stderr, "Specifying a cpupool is not allowed with other
options.\n");
+ return 1;
+ }
+ if (!dom && (opt_p || opt_b || opt_v)) {
+ fprintf(stderr, "Must specify a domain.\n");
+ return 1;
+ }
+ if ( (opt_v || opt_p || opt_b) && (opt_p + opt_b + opt_v != 3) ) {
+ fprintf(stderr, "Must specify vcpu, period, budget\n");
+ return 1;
+ }
+
+ if (!dom) { /* list all domain's rt scheduler info */
+ return -sched_domain_output(LIBXL_SCHEDULER_RT,
+ sched_rt_domain_output,
+ sched_rt_pool_output,
+ cpupool);
+ } else {
+ uint32_t domid = find_domain(dom);
+ if (!opt_p && !opt_b && !opt_v) { /* output rt scheduler info */
+ sched_rt_domain_output(-1);
+ return -sched_rt_domain_output(domid);
+ } else { /* set rt scheduler paramaters */
+ libxl_domain_sched_params scinfo;
+ libxl_domain_sched_params_init(&scinfo);
+ scinfo.sched = LIBXL_SCHEDULER_RT;
+ scinfo.rt.vcpu_index = vcpu_index;
+ scinfo.rt.period = period;
+ scinfo.rt.budget = budget;
+
+ rc = sched_domain_set(domid, &scinfo);
+ libxl_domain_sched_params_dispose(&scinfo);
+ if (rc)
+ return -rc;
+ }
+ }
+
+ return 0;
+}
+
int main_domid(int argc, char **argv)
{
uint32_t domid;
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
index 4279b9f..00500cb 100644
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -277,6 +277,15 @@ struct cmd_spec cmd_table[] = {
" --period/--slice)\n"
"-c CPUPOOL, --cpupool=CPUPOOL Restrict output to CPUPOOL"
},
+ { "sched-rt",
+ &main_sched_rt, 0, 1,
+ "Get/set rt scheduler parameters",
+ "[-d <Domain> [-v[=VCPU]] [-p[=PERIOD]] [-b[=BUDGET]]]",
+ "-d DOMAIN, --domain=DOMAIN Domain to modify\n"
+ "-v VCPU, --vcpu=VCPU VCPU\n"
+ "-p PERIOD, --period=PERIOD Period (us)\n"
+ "-b BUDGET, --budget=BUDGET Budget (us)\n"
+ },
{ "domid",
&main_domid, 0, 0,
"Convert a domain name to domain id",
--
1.7.9.5
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