Date: Fri, 20 Nov 2020 05:46:27 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r367862 - head/sys/cam Message-ID: <202011200546.0AK5kRu0076076@repo.freebsd.org>
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Author: mav Date: Fri Nov 20 05:46:27 2020 New Revision: 367862 URL: https://svnweb.freebsd.org/changeset/base/367862 Log: Microoptimize cam_num_doneqs math in xpt_done(). MFC after: 1 week Modified: head/sys/cam/cam_xpt.c Modified: head/sys/cam/cam_xpt.c ============================================================================== --- head/sys/cam/cam_xpt.c Fri Nov 20 03:54:46 2020 (r367861) +++ head/sys/cam/cam_xpt.c Fri Nov 20 05:46:27 2020 (r367862) @@ -178,7 +178,7 @@ struct cam_doneq { }; static struct cam_doneq cam_doneqs[MAXCPU]; -static int cam_num_doneqs; +static u_int __read_mostly cam_num_doneqs; static struct proc *cam_proc; SYSCTL_INT(_kern_cam, OID_AUTO, num_doneqs, CTLFLAG_RDTUN, @@ -4620,7 +4620,7 @@ xpt_done(union ccb *done_ccb) /* Store the time the ccb was in the sim */ done_ccb->ccb_h.qos.periph_data = cam_iosched_delta_t(done_ccb->ccb_h.qos.periph_data); - hash = (done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id + + hash = (u_int)(done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id + done_ccb->ccb_h.target_lun) % cam_num_doneqs; queue = &cam_doneqs[hash]; mtx_lock(&queue->cam_doneq_mtx);
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