[PATCH 1/3] virprocess: define sched_attr and sched_setattr

[Sasha Algisi]

In order to use SCHED_DEADLINE we need sched_setattr(), as
sched_setscheduler() does not support all the necessary parameters.

Signed-off-by: Sasha Algisi <sasha.algisi at edu.unito.it>
Signed-off-by: Dario Faggioli <dfaggioli at suse.com>
---
 src/util/virprocess.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/util/virprocess.c b/src/util/virprocess.c
index 013afd91b4..a8f86784e1 100644
--- a/src/util/virprocess.c
+++ b/src/util/virprocess.c
@@ -51,6 +51,10 @@
 # include <sys/cpuset.h>
 #endif
 
+#if WITH_SYS_SYSCALL_H
+# include <sys/syscall.h>
+#endif
+
 #ifdef WIN32
 # define WIN32_LEAN_AND_MEAN
 # include <windows.h>
@@ -67,6 +71,10 @@
 
 #define VIR_FROM_THIS VIR_FROM_NONE
 
+#if defined(__linux__) && !defined(SCHED_FLAG_RESET_ON_FORK)
+# define SCHED_FLAG_RESET_ON_FORK 0x01
+#endif
+
 VIR_LOG_INIT("util.process");
 
 VIR_ENUM_IMPL(virProcessSchedPolicy,
@@ -79,6 +87,37 @@ VIR_ENUM_IMPL(virProcessSchedPolicy,
 );
 
 
+#if defined(__linux__) && defined(SCHED_DEADLINE)
+
+struct sched_attr {
+    uint32_t size;
+    uint32_t sched_policy;
+    uint64_t sched_flags;
+
+    /*SCHED_OTHER, SCHED_BATCH*/
+    int32_t sched_nice;
+
+    /*SCHED_FIFO, SCHED_RR*/
+    uint32_t sched_priority;
+
+    /*SCHED_DEADLINE*/
+    uint64_t sched_runtime;
+    uint64_t sched_deadline;
+    uint64_t sched_period;
+};
+
+
+static
+int sched_setattr(pid_t pid,
+                  struct sched_attr *attr,
+                  unsigned int flags)
+{
+    return syscall(SYS_sched_setattr, pid, attr, flags);
+}
+
+#endif
+
+
 #ifndef WIN32
 /**
  * virProcessTranslateStatus:
-- 
2.37.1


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