Re: [Xen-devel] [PATCH v3 2/5] libxl: enable per-VCPU extratime flag for RTDS

[Dario Faggioli]

On Tue, 2017-10-10 at 19:17 -0400, Meng Xu wrote:
> Modify libxl_vcpu_sched_params_get/set and sched_rtds_vcpu_get/set
> functions to support per-VCPU extratime flag
> 
> Signed-off-by: Meng Xu 
> 
Reviewed-by: Dario Faggioli 

Regards,
Dario
-- 
<> (Raistlin Majere)
-
Dario Faggioli, Ph.D, http://about.me/dario.faggioli

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Re: [Xen-devel] [PATCH v3 2/5] libxl: enable per-VCPU extratime flag for RTDS

[Wei Liu]

On Tue, Oct 10, 2017 at 07:17:42PM -0400, Meng Xu wrote:
> Modify libxl_vcpu_sched_params_get/set and sched_rtds_vcpu_get/set
> functions to support per-VCPU extratime flag
> 
> Signed-off-by: Meng Xu 

Acked-by: Wei Liu 

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[Xen-devel] [PATCH v3 2/5] libxl: enable per-VCPU extratime flag for RTDS

[Meng Xu]

Modify libxl_vcpu_sched_params_get/set and sched_rtds_vcpu_get/set
functions to support per-VCPU extratime flag

Signed-off-by: Meng Xu 

---
Changes from v2
1) Move extratime out of the section
   that is marked as depreciated in libxl_domain_sched_params.
2) Set vcpu extratime in sched_rtds_vcpu_get function function;
   This fix a bug in previous version
   when run command "xl sched-rtds -d 0 -v 1" which
   outputs vcpu extratime value incorrectly.

Changes from v1
1) Add LIBXL_HAVE_SCHED_RTDS_VCPU_EXTRA to indicate if extratime flag is
supported
2) Change flag name in domctl.h from XEN_DOMCTL_SCHED_RTDS_extratime to
XEN_DOMCTL_SCHEDRT_extra

Changes from RFC v1
Change work_conserving flag to extratime flag
---
 tools/libxl/libxl.h |  6 ++
 tools/libxl/libxl_sched.c   | 17 +
 tools/libxl/libxl_types.idl |  8 
 3 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index f82b91e..5e9aed7 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -257,6 +257,12 @@
 #define LIBXL_HAVE_SCHED_RTDS_VCPU_PARAMS 1
 
 /*
+ * LIBXL_HAVE_SCHED_RTDS_VCPU_EXTRA indicates RTDS scheduler
+ * now supports per-vcpu extratime settings.
+ */
+#define LIBXL_HAVE_SCHED_RTDS_VCPU_EXTRA 1
+
+/*
  * libxl_domain_build_info has the arm.gic_version field.
  */
 #define LIBXL_HAVE_BUILDINFO_ARM_GIC_VERSION 1
diff --git a/tools/libxl/libxl_sched.c b/tools/libxl/libxl_sched.c
index 7d144d0..512788f 100644
--- a/tools/libxl/libxl_sched.c
+++ b/tools/libxl/libxl_sched.c
@@ -532,6 +532,8 @@ static int sched_rtds_vcpu_get(libxl__gc *gc, uint32_t 
domid,
 for (i = 0; i < num_vcpus; i++) {
 scinfo->vcpus[i].period = vcpus[i].u.rtds.period;
 scinfo->vcpus[i].budget = vcpus[i].u.rtds.budget;
+scinfo->vcpus[i].extratime =
+!!(vcpus[i].u.rtds.flags & XEN_DOMCTL_SCHEDRT_extra);
 scinfo->vcpus[i].vcpuid = vcpus[i].vcpuid;
 }
 rc = 0;
@@ -579,6 +581,8 @@ static int sched_rtds_vcpu_get_all(libxl__gc *gc, uint32_t 
domid,
 for (i = 0; i < num_vcpus; i++) {
 scinfo->vcpus[i].period = vcpus[i].u.rtds.period;
 scinfo->vcpus[i].budget = vcpus[i].u.rtds.budget;
+scinfo->vcpus[i].extratime =
+!!(vcpus[i].u.rtds.flags & XEN_DOMCTL_SCHEDRT_extra);
 scinfo->vcpus[i].vcpuid = vcpus[i].vcpuid;
 }
 rc = 0;
@@ -628,6 +632,10 @@ static int sched_rtds_vcpu_set(libxl__gc *gc, uint32_t 
domid,
 vcpus[i].vcpuid = scinfo->vcpus[i].vcpuid;
 vcpus[i].u.rtds.period = scinfo->vcpus[i].period;
 vcpus[i].u.rtds.budget = scinfo->vcpus[i].budget;
+if (scinfo->vcpus[i].extratime)
+vcpus[i].u.rtds.flags |= XEN_DOMCTL_SCHEDRT_extra;
+else
+vcpus[i].u.rtds.flags &= ~XEN_DOMCTL_SCHEDRT_extra;
 }
 
 r = xc_sched_rtds_vcpu_set(CTX->xch, domid,
@@ -676,6 +684,10 @@ static int sched_rtds_vcpu_set_all(libxl__gc *gc, uint32_t 
domid,
 vcpus[i].vcpuid = i;
 vcpus[i].u.rtds.period = scinfo->vcpus[0].period;
 vcpus[i].u.rtds.budget = scinfo->vcpus[0].budget;
+if (scinfo->vcpus[0].extratime)
+vcpus[i].u.rtds.flags |= XEN_DOMCTL_SCHEDRT_extra;
+else
+vcpus[i].u.rtds.flags &= ~XEN_DOMCTL_SCHEDRT_extra;
 }
 
 r = xc_sched_rtds_vcpu_set(CTX->xch, domid,
@@ -726,6 +738,11 @@ static int sched_rtds_domain_set(libxl__gc *gc, uint32_t 
domid,
 sdom.period = scinfo->period;
 if (scinfo->budget != LIBXL_DOMAIN_SCHED_PARAM_BUDGET_DEFAULT)
 sdom.budget = scinfo->budget;
+/* Set extratime by default */
+if (scinfo->extratime)
+sdom.flags |= XEN_DOMCTL_SCHEDRT_extra;
+else
+sdom.flags &= ~XEN_DOMCTL_SCHEDRT_extra;
 if (sched_rtds_validate_params(gc, sdom.period, sdom.budget))
 return ERROR_INVAL;
 
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 2d0bb8a..dd7d364 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -421,14 +421,14 @@ libxl_domain_sched_params = Struct("domain_sched_params",[
 ("cap",  integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_CAP_DEFAULT'}),
 ("period",   integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT'}),
 ("budget",   integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_BUDGET_DEFAULT'}),
+("extratime",integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT'}),
 
-# The following three parameters ('slice', 'latency' and 'extratime') are 
deprecated,
+# The following three parameters ('slice' and 'latency') are deprecated,
 # and will have no effect if used, since the SEDF scheduler has been 
removed.
-# Note that 'period' was an SDF parameter too, but it is still effective 
as it is
-# now used (together with 'budget') by the RTDS scheduler.
+# Note that 'period' and 'extratime' was an SDF parameter too, but it is