[v2,1/7] xen: credit2: factor cpu to runqueue matching in a function
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Message ID 159070136424.12060.2223986236933194278.stgit@Palanthas
State New
Headers show
Series
  • xen: credit2: limit the number of CPUs per runqueue
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Commit Message

Dario Faggioli May 28, 2020, 9:29 p.m. UTC
Just move the big if() condition in an inline function.

No functional change intended.

Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
Cc: George Dunlap <george.dunlap@citrix.com>
Cc: Juergen Gross <jgross@suse.com>
---
 xen/common/sched/credit2.c |   28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

Comments

Jürgen Groß May 29, 2020, 2:48 p.m. UTC | #1
On 28.05.20 23:29, Dario Faggioli wrote:
> Just move the big if() condition in an inline function.
> 
> No functional change intended.
> 
> Signed-off-by: Dario Faggioli <dfaggioli@suse.com>

Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen

Patch
diff mbox series

diff --git a/xen/common/sched/credit2.c b/xen/common/sched/credit2.c
index 34f05c3e2a..697c9f917d 100644
--- a/xen/common/sched/credit2.c
+++ b/xen/common/sched/credit2.c
@@ -838,6 +838,20 @@  static inline bool same_core(unsigned int cpua, unsigned int cpub)
            cpu_to_core(cpua) == cpu_to_core(cpub);
 }
 
+static inline bool
+cpu_runqueue_match(const struct csched2_runqueue_data *rqd, unsigned int cpu)
+{
+    unsigned int peer_cpu = rqd->pick_bias;
+
+    BUG_ON(cpu_to_socket(peer_cpu) == XEN_INVALID_SOCKET_ID);
+
+    /* OPT_RUNQUEUE_CPU will never find an existing runqueue. */
+    return opt_runqueue == OPT_RUNQUEUE_ALL ||
+           (opt_runqueue == OPT_RUNQUEUE_CORE && same_core(peer_cpu, cpu)) ||
+           (opt_runqueue == OPT_RUNQUEUE_SOCKET && same_socket(peer_cpu, cpu)) ||
+           (opt_runqueue == OPT_RUNQUEUE_NODE && same_node(peer_cpu, cpu));
+}
+
 static struct csched2_runqueue_data *
 cpu_add_to_runqueue(struct csched2_private *prv, unsigned int cpu)
 {
@@ -855,21 +869,11 @@  cpu_add_to_runqueue(struct csched2_private *prv, unsigned int cpu)
     rqd_ins = &prv->rql;
     list_for_each_entry ( rqd, &prv->rql, rql )
     {
-        unsigned int peer_cpu;
-
         /* Remember first unused queue index. */
         if ( !rqi_unused && rqd->id > rqi )
             rqi_unused = true;
 
-        peer_cpu = rqd->pick_bias;
-        BUG_ON(cpu_to_socket(cpu) == XEN_INVALID_SOCKET_ID ||
-               cpu_to_socket(peer_cpu) == XEN_INVALID_SOCKET_ID);
-
-        /* OPT_RUNQUEUE_CPU will never find an existing runqueue. */
-        if ( opt_runqueue == OPT_RUNQUEUE_ALL ||
-             (opt_runqueue == OPT_RUNQUEUE_CORE && same_core(peer_cpu, cpu)) ||
-             (opt_runqueue == OPT_RUNQUEUE_SOCKET && same_socket(peer_cpu, cpu)) ||
-             (opt_runqueue == OPT_RUNQUEUE_NODE && same_node(peer_cpu, cpu)) )
+        if ( cpu_runqueue_match(rqd, cpu) )
         {
             rqd_valid = true;
             break;
@@ -3744,6 +3748,8 @@  csched2_alloc_pdata(const struct scheduler *ops, int cpu)
     struct csched2_pcpu *spc;
     struct csched2_runqueue_data *rqd;
 
+    BUG_ON(cpu_to_socket(cpu) == XEN_INVALID_SOCKET_ID);
+
     spc = xzalloc(struct csched2_pcpu);
     if ( spc == NULL )
         return ERR_PTR(-ENOMEM);