From 60650f953b2eb5aa46e126676e796a4e6e5259bf Mon Sep 17 00:00:00 2001 From: Asias He Date: Tue, 29 Nov 2011 21:04:04 +0800 Subject: [PATCH] kvm tools: Get multiple io events at a time This patch reduces the number of calls to io_getevents() by getting multiple io events at a time instead of one in disk image thread. Signed-off-by: Asias He Signed-off-by: Pekka Enberg --- tools/kvm/disk/core.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/tools/kvm/disk/core.c b/tools/kvm/disk/core.c index cc2a1f67a896..4915efdc190c 100644 --- a/tools/kvm/disk/core.c +++ b/tools/kvm/disk/core.c @@ -13,14 +13,15 @@ int debug_iodelay; static void *disk_image__thread(void *param) { struct disk_image *disk = param; + struct io_event event[AIO_MAX]; + struct timespec notime = {0}; + int nr, i; u64 dummy; while (read(disk->evt, &dummy, sizeof(dummy)) > 0) { - struct io_event event; - struct timespec notime = {0}; - - while (io_getevents(disk->ctx, 1, 1, &event, ¬ime) > 0) - disk->disk_req_cb(event.data, event.res); + nr = io_getevents(disk->ctx, 1, ARRAY_SIZE(event), event, ¬ime); + for (i = 0; i < nr; i++) + disk->disk_req_cb(event[i].data, event[i].res); } return NULL; -- 2.39.5