[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCHv2 5/5] 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 cache line), thus putting the per-channel locks into their own cache line. This does not decrease the number of struct evtchn's per-page. Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> --- I'm not sure we actually want to do this. I think it would be better to pack the struct evtchn and use vmap to turn the pages into a linear array for quicker lookup. --- xen/include/xen/sched.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 44ea92d..a0ff9d2 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 */ -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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