[xen master] xen/cpupool: add missing bits for per-cpupool scheduling granularity

[patchbot@xxxxxxx]

commit 1283ad87c6314daed6e9e7af2ab5202d96276202
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Wed Dec 2 10:12:37 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Dec 2 10:12:37 2020 +0100

    xen/cpupool: add missing bits for per-cpupool scheduling granularity
    
    Even with storing the scheduling granularity in struct cpupool there
    are still a few bits missing for being able to have cpupools with
    different granularity (apart from the missing interface for setting
    the individual granularities): the number of cpus in a scheduling
    unit is always taken from the global sched_granularity variable.
    
    So store the value in struct cpupool and use that instead of
    sched_granularity.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Dario Faggioli <dfaggioli@xxxxxxxx>
---
 xen/common/sched/cpupool.c | 3 ++-
 xen/common/sched/private.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/common/sched/cpupool.c b/xen/common/sched/cpupool.c
index 7ea641ca26..6429c8f7b5 100644
--- a/xen/common/sched/cpupool.c
+++ b/xen/common/sched/cpupool.c
@@ -151,7 +151,7 @@ static void __init cpupool_gran_init(void)
 
 unsigned int cpupool_get_granularity(const struct cpupool *c)
 {
-    return c ? sched_granularity : 1;
+    return c ? c->sched_gran : 1;
 }
 
 static void free_cpupool_struct(struct cpupool *c)
@@ -289,6 +289,7 @@ static struct cpupool *cpupool_create(
     }
     c->sched->cpupool = c;
     c->gran = opt_sched_granularity;
+    c->sched_gran = sched_granularity;
 
     *q = c;
 
diff --git a/xen/common/sched/private.h b/xen/common/sched/private.h
index df50976eb2..685992cab9 100644
--- a/xen/common/sched/private.h
+++ b/xen/common/sched/private.h
@@ -514,6 +514,7 @@ struct cpupool
     struct scheduler *sched;
     atomic_t         refcnt;
     enum sched_gran  gran;
+    unsigned int     sched_gran;     /* Number of cpus per sched-item. */
 };
 
 static inline cpumask_t *cpupool_domain_master_cpumask(const struct domain *d)
--
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