From owner-svn-src-head@freebsd.org Sun Sep 6 20:46:16 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 76F173DD048; Sun, 6 Sep 2020 20:46:16 +0000 (UTC) (envelope-from asomers@gmail.com) Received: from mail-oi1-f182.google.com (mail-oi1-f182.google.com [209.85.167.182]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Bl3NR3C3dz4SFW; Sun, 6 Sep 2020 20:46:15 +0000 (UTC) (envelope-from asomers@gmail.com) Received: by mail-oi1-f182.google.com with SMTP id 3so11891741oih.0; Sun, 06 Sep 2020 13:46:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=J2kqSum5GBHdgMRY6IMHvhC6etFTdnea3iCvZhRZ46g=; b=swEFGiGNv4OmVVaO0IyNaextYPoVBeXCOKWZ6rR50j9kzOrhOcTu2XjQKksaow41wr 03V3G1tpLJtoJieRkUr5p4kw0yth5s+8Ap/j+t4/i7vsq1G3RESYTVvza/IQrICgMSMm 6Cy1J4L68QgpFvtE7XS4V0xdCoCO3elgS4AJYmYRRqpsn53K0bOepkRJOoutB4tgQ6XA Xe9+LqPdBwYElB9WkePJKVRwkHWW4s3wqDjL7HQhUWrHLd+d7jAvg9Gm3Bxh4GEgmaCp htpigXXwHnh4xQrYN+/Qw4yDWZWr7wcdGnXk3guUkUl+i8TTwmtVqbykEwTtx/SRy5Ft h3jA== X-Gm-Message-State: AOAM530WvwJ2RClz631wZwuPEjS1K+dlb2f2kbAFMlRuB33VFCTXO/bS IQlXzIzR2ZEMySlH9JYNyF3Nsvywc70/naJPlsDS/1A6 X-Google-Smtp-Source: ABdhPJwoxVUllLSLqwGjgIhIrJ887KOuHSdg7O3S7Z0BS6n+ZytElZNmR1fA1VRvYfcFyeSMIKzL9X267ARBatHST8g= X-Received: by 2002:aca:45c2:: with SMTP id s185mr11133586oia.57.1599425173774; Sun, 06 Sep 2020 13:46:13 -0700 (PDT) MIME-Version: 1.0 References: <202008240900.07O90w9Y093073@repo.freebsd.org> In-Reply-To: <202008240900.07O90w9Y093073@repo.freebsd.org> From: Alan Somers Date: Sun, 6 Sep 2020 14:46:02 -0600 Message-ID: Subject: Re: svn commit: r364637 - head/sys/kern To: Mateusz Guzik Cc: src-committers , svn-src-all , svn-src-head X-Rspamd-Queue-Id: 4Bl3NR3C3dz4SFW X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; 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charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.33 X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.33 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: Sun, 06 Sep 2020 20:46:16 -0000 On Mon, Aug 24, 2020 at 3:01 AM Mateusz Guzik wrote: > Author: mjg > Date: Mon Aug 24 09:00:57 2020 > New Revision: 364637 > URL: https://svnweb.freebsd.org/changeset/base/364637 > > Log: > cache: lockless reverse lookup > > This enables fully scalable operation for getcwd and significantly > improves > realpath. > > For example: > PATH_CUSTOM=/usr/src ./getcwd_processes -t 104 > before: 1550851 > after: 380135380 > > Tested by: pho > > Modified: > head/sys/kern/vfs_cache.c > > Modified: head/sys/kern/vfs_cache.c > > ============================================================================== > --- head/sys/kern/vfs_cache.c Mon Aug 24 09:00:07 2020 (r364636) > +++ head/sys/kern/vfs_cache.c Mon Aug 24 09:00:57 2020 (r364637) > @@ -477,6 +485,8 @@ STATNODE_COUNTER(shrinking_skipped, > static void cache_zap_locked(struct namecache *ncp); > static int vn_fullpath_hardlink(struct nameidata *ndp, char **retbuf, > char **freebuf, size_t *buflen); > +static int vn_fullpath_any_smr(struct vnode *vp, struct vnode *rdir, char > *buf, > + char **retbuf, size_t *buflen, bool slash_prefixed, size_t addend); > static int vn_fullpath_any(struct vnode *vp, struct vnode *rdir, char > *buf, > char **retbuf, size_t *buflen); > static int vn_fullpath_dir(struct vnode *vp, struct vnode *rdir, char > *buf, > @@ -2476,9 +2486,17 @@ vn_getcwd(char *buf, char **retbuf, size_t *buflen) > What does the "smr" stand for? -Alan