From owner-svn-src-head@freebsd.org Mon Aug 3 20:43:37 2015 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 85D459B2F51; Mon, 3 Aug 2015 20:43:37 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 5DC84150; Mon, 3 Aug 2015 20:43:37 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.70]) by repo.freebsd.org (8.14.9/8.14.9) with ESMTP id t73KhbpE001920; Mon, 3 Aug 2015 20:43:37 GMT (envelope-from jhb@FreeBSD.org) Received: (from jhb@localhost) by repo.freebsd.org (8.14.9/8.14.9/Submit) id t73Kha3U001918; Mon, 3 Aug 2015 20:43:36 GMT (envelope-from jhb@FreeBSD.org) Message-Id: <201508032043.t73Kha3U001918@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jhb set sender to jhb@FreeBSD.org using -f From: John Baldwin Date: Mon, 3 Aug 2015 20:43:36 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r286256 - head/sys/kern X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Aug 2015 20:43:37 -0000 Author: jhb Date: Mon Aug 3 20:43:36 2015 New Revision: 286256 URL: https://svnweb.freebsd.org/changeset/base/286256 Log: kgdb uses td_oncpu to determine if a thread is running and should use a pcb from stoppcbs[] rather than the thread's PCB. However, exited threads retained td_oncpu from the last time they ran, and newborn threads had their CPU fields cleared to zero during fork and thread creation since they are in the set of fields zeroed when threads are setup. To fix, explicitly update the CPU fields for exiting threads in sched_throw() to reflect the switch out and reset the CPU fields for new threads in sched_fork_thread() to NOCPU. Reviewed by: kib MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D3193 Modified: head/sys/kern/sched_4bsd.c head/sys/kern/sched_ule.c Modified: head/sys/kern/sched_4bsd.c ============================================================================== --- head/sys/kern/sched_4bsd.c Mon Aug 3 20:30:27 2015 (r286255) +++ head/sys/kern/sched_4bsd.c Mon Aug 3 20:43:36 2015 (r286256) @@ -792,6 +792,8 @@ sched_fork_thread(struct thread *td, str { struct td_sched *ts; + childtd->td_oncpu = NOCPU; + childtd->td_lastcpu = NOCPU; childtd->td_estcpu = td->td_estcpu; childtd->td_lock = &sched_lock; childtd->td_cpuset = cpuset_ref(td->td_cpuset); @@ -1671,6 +1673,8 @@ sched_throw(struct thread *td) } else { lock_profile_release_lock(&sched_lock.lock_object); MPASS(td->td_lock == &sched_lock); + td->td_lastcpu = td->td_oncpu; + td->td_oncpu = NOCPU; } mtx_assert(&sched_lock, MA_OWNED); KASSERT(curthread->td_md.md_spinlock_count == 1, ("invalid count")); Modified: head/sys/kern/sched_ule.c ============================================================================== --- head/sys/kern/sched_ule.c Mon Aug 3 20:30:27 2015 (r286255) +++ head/sys/kern/sched_ule.c Mon Aug 3 20:43:36 2015 (r286256) @@ -2080,6 +2080,8 @@ sched_fork_thread(struct thread *td, str */ ts = td->td_sched; ts2 = child->td_sched; + child->td_oncpu = NOCPU; + child->td_lastcpu = NOCPU; child->td_lock = TDQ_LOCKPTR(tdq); child->td_cpuset = cpuset_ref(td->td_cpuset); ts2->ts_cpu = ts->ts_cpu; @@ -2703,6 +2705,8 @@ sched_throw(struct thread *td) MPASS(td->td_lock == TDQ_LOCKPTR(tdq)); tdq_load_rem(tdq, td); lock_profile_release_lock(&TDQ_LOCKPTR(tdq)->lock_object); + td->td_lastcpu = td->td_oncpu; + td->td_oncpu = NOCPU; } KASSERT(curthread->td_md.md_spinlock_count == 1, ("invalid count")); newtd = choosethread();