2015-07-10 17:21:29 +02:00
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# Commit b58214a24231a1f2a7e09ae9cc3014eff752918b
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# Date 2015-06-22 11:39:46 +0200
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# Author David Vrabel <david.vrabel@citrix.com>
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# Committer Jan Beulich <jbeulich@suse.com>
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evtchn: pad struct evtchn to 64 bytes
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The number of struct evtchn in a page must be a power of two. Under
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some workloads performance is improved slightly by padding struct
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evtchn to 64 bytes (a typical cache line size), thus putting the fewer
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per-channel locks into each cache line.
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This does not decrease the number of struct evtchn's per-page.
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Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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Acked-by: Jan Beulich <jbeulich@suse.com>
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2015-08-27 00:28:15 +02:00
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--- a/xen/include/xen/sched.h
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+++ b/xen/include/xen/sched.h
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2015-07-10 17:21:29 +02:00
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@@ -129,7 +129,7 @@ struct evtchn
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#endif
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} ssid;
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#endif
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-};
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+} __attribute__((aligned(64)));
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int evtchn_init(struct domain *d); /* from domain_create */
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void evtchn_destroy(struct domain *d); /* from domain_kill */
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