From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Liu Subject: [RFC PATCH V4 11/18] Bump EVTCHNS_PER_BUCKET to 512 Date: Tue, 5 Mar 2013 12:30:33 +0000 Message-ID: <1362486640-14707-12-git-send-email-wei.liu2@citrix.com> References: <1362486640-14707-1-git-send-email-wei.liu2@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1362486640-14707-1-git-send-email-wei.liu2@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xen.org Cc: Wei Liu , keir@xen.org, ian.campbell@citrix.com, jbeulich@suse.com, david.vrabel@citrix.com List-Id: xen-devel@lists.xenproject.org For 64 bit build and 3-level event channel and the original value of EVTCHNS_PER_BUCKET (128), the space needed to accommodate d->evtchn would be 4 pages (PAGE_SIZE = 4096). Given that not every domain needs 3-level event channel, this leads to waste of memory. Having EVTCHN_PER_BUCKETS to be 512 can occupy exact one page. Signed-off-by: Wei Liu --- xen/include/xen/event.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h index 919f0e2..e2c3736 100644 --- a/xen/include/xen/event.h +++ b/xen/include/xen/event.h @@ -39,7 +39,7 @@ static inline unsigned int max_evtchns(struct domain *d) return ret; } -#define EVTCHNS_PER_BUCKET 128 +#define EVTCHNS_PER_BUCKET 512 #define NR_EVTCHN_BUCKETS (NR_EVENT_CHANNELS / EVTCHNS_PER_BUCKET) struct evtchn -- 1.7.10.4