From owner-svn-src-head@freebsd.org Mon Jan 6 22:08:11 2020 Return-Path: Delivered-To: svn-src-head@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 91E5D1F5135; Mon, 6 Jan 2020 22:08:11 +0000 (UTC) (envelope-from glebius@freebsd.org) Received: from cell.glebi.us (glebi.us [162.251.186.162]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "cell.glebi.us", Issuer "cell.glebi.us" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 47s8lb2XZ8z4JF9; Mon, 6 Jan 2020 22:08:10 +0000 (UTC) (envelope-from glebius@freebsd.org) Received: from cell.glebi.us (localhost [127.0.0.1]) by cell.glebi.us (8.15.2/8.15.2) with ESMTPS id 006M82QG034310 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Mon, 6 Jan 2020 14:08:03 -0800 (PST) (envelope-from glebius@freebsd.org) Received: (from glebius@localhost) by cell.glebi.us (8.15.2/8.15.2/Submit) id 006M8219034309; Mon, 6 Jan 2020 14:08:02 -0800 (PST) (envelope-from glebius@freebsd.org) X-Authentication-Warning: cell.glebi.us: glebius set sender to glebius@freebsd.org using -f Date: Mon, 6 Jan 2020 14:08:02 -0800 From: Gleb Smirnoff To: Jeff Roberson Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r356389 - head/sys/vm Message-ID: <20200106220802.GI3339@FreeBSD.org> References: <202001052254.005MsQsH027909@repo.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202001052254.005MsQsH027909@repo.freebsd.org> User-Agent: Mutt/1.12.2 (2019-09-21) X-Rspamd-Queue-Id: 47s8lb2XZ8z4JF9 X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-5.99 / 15.00]; NEURAL_HAM_MEDIUM(-0.99)[-0.995,0]; REPLY(-4.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 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, 06 Jan 2020 22:08:11 -0000 Jeff, On Sun, Jan 05, 2020 at 10:54:26PM +0000, Jeff Roberson wrote: J> Author: jeff J> Date: Sun Jan 5 22:54:25 2020 J> New Revision: 356389 J> URL: https://svnweb.freebsd.org/changeset/base/356389 J> J> Log: J> The fix in r356353 was insufficient. Not every architecture returns 0 for J> EARLY_COUNTER. Only amd64 seems to. J> J> Suggested by: markj J> Reported by: lwhsu J> Reviewed by: markj J> PR: 243117 J> J> Modified: J> head/sys/vm/uma_core.c J> J> Modified: head/sys/vm/uma_core.c J> ============================================================================== J> --- head/sys/vm/uma_core.c Sun Jan 5 21:35:02 2020 (r356388) J> +++ head/sys/vm/uma_core.c Sun Jan 5 22:54:25 2020 (r356389) J> @@ -4153,8 +4153,10 @@ uma_zone_get_cur(uma_zone_t zone) J> int64_t nitems; J> u_int i; J> J> - nitems = counter_u64_fetch(zone->uz_allocs) - J> - counter_u64_fetch(zone->uz_frees); J> + nitems = 0; J> + if (zone->uz_allocs != EARLY_COUNTER && zone->uz_frees != EARLY_COUNTER) J> + nitems = counter_u64_fetch(zone->uz_allocs) - J> + counter_u64_fetch(zone->uz_frees); J> CPU_FOREACH(i) J> nitems += atomic_load_64(&zone->uz_cpu[i].uc_allocs) - J> atomic_load_64(&zone->uz_cpu[i].uc_frees); J> @@ -4168,7 +4170,9 @@ uma_zone_get_allocs(uma_zone_t zone) J> uint64_t nitems; J> u_int i; J> J> - nitems = counter_u64_fetch(zone->uz_allocs); J> + nitems = 0; J> + if (zone->uz_allocs != EARLY_COUNTER) J> + nitems = counter_u64_fetch(zone->uz_allocs); J> CPU_FOREACH(i) J> nitems += atomic_load_64(&zone->uz_cpu[i].uc_allocs); J> J> @@ -4181,7 +4185,9 @@ uma_zone_get_frees(uma_zone_t zone) J> uint64_t nitems; J> u_int i; J> J> - nitems = counter_u64_fetch(zone->uz_frees); J> + nitems = 0; J> + if (zone->uz_frees != EARLY_COUNTER) J> + nitems = counter_u64_fetch(zone->uz_frees); J> CPU_FOREACH(i) J> nitems += atomic_load_64(&zone->uz_cpu[i].uc_frees); IMHO, tidier code would be not to check the pointers, but check UMA booted status: if (__predict_true(booted == BOOT_RUNNING)) nitems = counter_u64_fetch(zone->uz_frees); -- Gleb Smirnoff