[Xen-changelog] [xen master] evtchn: pad struct evtchn to 64 bytes

[patchbot@xxxxxxx]

commit b58214a24231a1f2a7e09ae9cc3014eff752918b
Author:     David Vrabel <david.vrabel@xxxxxxxxxx>
AuthorDate: Mon Jun 22 11:39:46 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 22 11:39:46 2015 +0200

    evtchn: pad struct evtchn to 64 bytes
    
    The number of struct evtchn in a page must be a power of two.  Under
    some workloads performance is improved slightly by padding struct
    evtchn to 64 bytes (a typical cache line size), thus putting the fewer
    per-channel locks into each cache line.
    
    This does not decrease the number of struct evtchn's per-page.
    
    Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/include/xen/sched.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index ce10a66..b29d9e7 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -129,7 +129,7 @@ struct evtchn
 #endif
     } ssid;
 #endif
-};
+} __attribute__((aligned(64)));
 
 int  evtchn_init(struct domain *d); /* from domain_create */
 void evtchn_destroy(struct domain *d); /* from domain_kill */
--
generated by git-patchbot for /home/xen/git/xen.git#master

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