tools: xenpm: continue to support {set, get}-vcpu-migration-delay

Now that it is possible to get and set the migration
delay via the SCHEDOP sysctl, use that in xenpm, instead
of the special purpose libxc interface (which will be
removed in a following commit).

The sysctl, however, requires a cpupool-id argument,
for knowing on which scheduler it is operating on. In
this case, since we don't want to alter xenpm's command
line interface, we always use '0', which means xenpm
will always act on the default cpupool ('Pool-0').

>From this commit on, `xenpm {set,get}-vcpu-migration-delay'
commands work again. But that is only for the sake of
backward compatibility, and their use is deprecated, in
favour of 'xl sched-credit -s [-c <poolid>] -m <delay>'.

Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index 762311e5a5639f50300a2d3f7dcbc58804492c89..0e1968a23d6d32a031110635fc24d7889b9bc672 100644 (file)
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -1071,14 +1071,24 @@ void set_sched_smt_func(int argc, char *argv[])
 
 void set_vcpu_migration_delay_func(int argc, char *argv[])
 {
+    struct xen_sysctl_credit_schedule sparam;
     int value;
 
+    fprintf(stderr, "WARNING: using xenpm for this purpose is deprecated."
+           " Check out `xl sched-credit -s -m DELAY'\n");
+
     if ( argc != 1 || (value = atoi(argv[0])) < 0 ) {
         fprintf(stderr, "Missing or invalid argument(s)\n");
         exit(EINVAL);
     }
 
-    if ( !xc_set_vcpu_migration_delay(xc_handle, value) )
+    if ( xc_sched_credit_params_get(xc_handle, 0, &sparam) < 0 ) {
+        fprintf(stderr, "getting Credit scheduler parameters failed\n");
+        exit(EINVAL);
+    }
+    sparam.vcpu_migr_delay_us = value;
+
+    if ( !xc_sched_credit_params_set(xc_handle, 0, &sparam) )
         printf("set vcpu migration delay to %d us succeeded\n", value);
     else
         fprintf(stderr, "set vcpu migration delay failed (%d - %s)\n",
@@ -1087,13 +1097,17 @@ void set_vcpu_migration_delay_func(int argc, char *argv[])
 
 void get_vcpu_migration_delay_func(int argc, char *argv[])
 {
-    uint32_t value;
+    struct xen_sysctl_credit_schedule sparam;
+
+    fprintf(stderr, "WARNING: using xenpm for this purpose is deprecated."
+           " Check out `xl sched-credit -s'\n");
 
     if ( argc )
         fprintf(stderr, "Ignoring argument(s)\n");
 
-    if ( !xc_get_vcpu_migration_delay(xc_handle, &value) )
-        printf("Scheduler vcpu migration delay is %d us\n", value);
+    if ( !xc_sched_credit_params_get(xc_handle, 0, &sparam) )
+        printf("Scheduler vcpu migration delay is %d us\n",
+               sparam.vcpu_migr_delay_us);
     else
         fprintf(stderr,
                 "Failed to get scheduler vcpu migration delay (%d - %s)\n",