[Xen-devel] [PATCH 2/2] Set sched_smt_power_savings by xenpm

["Yu, Ke" <ke.yu@xxxxxxxxx>]

Set sched_smt_power_savings by xenpm

Signed-off-by: Yu Ke <ke.yu@xxxxxxxxx>

diff -r 0bd8fb8941bc tools/libxc/xc_pm.c
--- a/tools/libxc/xc_pm.c
+++ b/tools/libxc/xc_pm.c
@@ -334,3 +334,20 @@ int xc_get_cputopo(int xc_handle, struct
     return rc;
 }
 
+/* value:   0 - disable sched_smt_power_savings 
+            1 - enable sched_smt_power_savings
+ */
+int xc_set_sched_opt_smt(int xc_handle, uint32_t value)
+{
+   int rc;
+   DECLARE_SYSCTL;
+
+   sysctl.cmd = XEN_SYSCTL_pm_op;
+   sysctl.u.pm_op.cmd = XEN_SYSCTL_pm_op_set_sched_opt_smt;
+   sysctl.u.pm_op.cpuid = 0;
+   sysctl.u.pm_op.set_sched_opt_smt = value;
+   rc = do_sysctl(xc_handle, &sysctl);
+
+   return rc;
+}
+
diff -r 0bd8fb8941bc tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1266,4 +1266,6 @@ struct xc_get_cputopo {
 
 int xc_get_cputopo(int xc_handle, struct xc_get_cputopo *info);
 
+int xc_set_sched_opt_smt(int xc_handle, uint32_t value);
+
 #endif /* XENCTRL_H */
diff -r 0bd8fb8941bc tools/misc/xenpm.c
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -56,6 +56,7 @@ void show_help(void)
             " set-up-threshold      [cpuid] <num> set up threshold on CPU 
<cpuid> or all\n"
             "                                     it is used in ondemand 
governor.\n"
             " get-cpu-topology                    get thread/core/socket 
topology info\n"
+            " set-sched-smt           enable|disable enable/disable scheduler 
smt power saving\n"
             " start [seconds]                     start collect Cx/Px 
statistics,\n"
             "                                     output after CTRL-C or 
SIGINT or several seconds.\n"
             );
@@ -861,6 +862,36 @@ void cpu_topology_func(int argc, char *a
     return ;
 }
 
+void set_sched_smt_func(int argc, char *argv[])
+{
+    int value, rc;
+
+    if (argc != 1){
+        show_help();
+        exit(-1);
+    }
+
+    if ( !strncmp(argv[0], "disable", sizeof("disable")) )
+    {
+        value = 0;
+    }
+    else if ( !strncmp(argv[0], "enable", sizeof("enable")) )
+    {
+        value = 1;
+    }
+    else
+    {
+        show_help();
+        exit(-1);
+    }
+
+    rc = xc_set_sched_opt_smt(xc_fd, value);
+    printf("%s sched_smt_power_savings %s\n", argv[0],
+                    rc? "failed":"successeed" );
+
+    return;
+}
+
 struct {
     const char *name;
     void (*function)(int argc, char *argv[]);
@@ -877,6 +908,7 @@ struct {
     { "set-sampling-rate", scaling_sampling_rate_func },
     { "set-up-threshold", scaling_up_threshold_func },
     { "get-cpu-topology", cpu_topology_func},
+    { "set-sched-smt", set_sched_smt_func},
 };
 
 int main(int argc, char *argv[])
diff -r 0bd8fb8941bc xen/drivers/acpi/pmstat.c
--- a/xen/drivers/acpi/pmstat.c
+++ b/xen/drivers/acpi/pmstat.c
@@ -500,6 +500,17 @@ int do_pm_op(struct xen_sysctl_pm_op *op
         break;
     }
 
+    case XEN_SYSCTL_pm_op_set_sched_opt_smt:
+    {
+        uint32_t saved_value;
+
+        saved_value = sched_smt_power_savings;
+        sched_smt_power_savings = !!op->set_sched_opt_smt;
+        op->set_sched_opt_smt = saved_value;
+
+        break;
+    }
+
     default:
         printk("not defined sub-hypercall @ do_pm_op\n");
         ret = -ENOSYS;
diff -r 0bd8fb8941bc xen/include/public/sysctl.h
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -355,11 +355,9 @@ struct xen_set_cpufreq_para {
 
     uint32_t ctrl_type;
     uint32_t ctrl_value;
-}
-;
+};
+
 /* Get physical CPU topology information. */
-
-
 #define INVALID_TOPOLOGY_ID  (~0U)
 struct xen_get_cputopo {
      /* IN: maximum addressable entry in
@@ -387,6 +385,9 @@ struct xen_sysctl_pm_op {
     /* get CPU topology */
     #define XEN_SYSCTL_pm_op_get_cputopo  0x20
 
+    /* set/reset scheduler power saving option */
+    #define XEN_SYSCTL_pm_op_set_sched_opt_smt    0x21
+
     uint32_t cmd;
     uint32_t cpuid;
     union {
@@ -394,6 +395,7 @@ struct xen_sysctl_pm_op {
         struct xen_set_cpufreq_gov  set_gov;
         struct xen_set_cpufreq_para set_para;
         struct xen_get_cputopo      get_topo;
+        uint32_t                    set_sched_opt_smt;
     };
 };

Attachment: sched_smt_power_savings_2_xenpm.patch
Description: sched_smt_power_savings_2_xenpm.patch

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