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xen
5587d7e2-evtchn-pad-struct-evtchn-to-64-bytes.p...
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File 5587d7e2-evtchn-pad-struct-evtchn-to-64-bytes.patch of Package xen
# Commit b58214a24231a1f2a7e09ae9cc3014eff752918b # Date 2015-06-22 11:39:46 +0200 # Author David Vrabel <david.vrabel@citrix.com> # Committer Jan Beulich <jbeulich@suse.com> 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@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> --- 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 */
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