From owner-freebsd-bugs@freebsd.org Wed Dec 4 17:23:13 2019 Return-Path: Delivered-To: freebsd-bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 2724F1A90EB for ; Wed, 4 Dec 2019 17:23:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 47Sm010K0Rz46Qh for ; Wed, 4 Dec 2019 17:23:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 0AC4E1A90EA; Wed, 4 Dec 2019 17:23:13 +0000 (UTC) Delivered-To: bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 0A8761A90E9 for ; Wed, 4 Dec 2019 17:23:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47Sm006cZ5z46Qg for ; Wed, 4 Dec 2019 17:23:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id C7A6A3974 for ; Wed, 4 Dec 2019 17:23:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id xB4HNCOm014847 for ; Wed, 4 Dec 2019 17:23:12 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id xB4HNCDf014844 for bugs@FreeBSD.org; Wed, 4 Dec 2019 17:23:12 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 242427] pmap_remove() sometimes is very slow causing 10+ minutes long reboots Date: Wed, 04 Dec 2019 17:23:12 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.3-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: pen@lysator.liu.se X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Dec 2019 17:23:13 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D242427 --- Comment #4 from Peter Eriksson --- (In reply to Peter Eriksson from comment #3) Before someone asks - yes, in theory since I'm using the "if (time_second-t0>0)" check, then it _could_ be just coincidence and that the clock steps 1s just between the two reads of time_second. However, it is consistent (all 4 levels of calls return 1 (and they read the time spent separately) - and I see it printed 14 times), and the loop in keg_drain rep= orts 14 seconds - so I doubt that it would be the case. Not all the time atleast= ... :-) > kmem_unback: pmap_remove(kernel_pmap, 18446741877714755584, 1844674187771= 4767872) took 1 seconds > kmem_free: kmem_unback(kmem_object, 18446741877714755584, 12288) took 1 s= econds > page_free: kmem_free(kmem_arena, 18446741877714755584, 12288) took 1 seco= nds > keg_free_slab: keg->uk_freef(mem) {page_free} took 1 seconds (The four lines above is repeated 14 times, with different addresses of cou= rse) > keg_drain: while-keg_free_slab-loop took 14 seconds [20021 loops, 14 slow= calls] --=20 You are receiving this mail because: You are the assignee for the bug.=