Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932800Ab0AGBqN (ORCPT ); Wed, 6 Jan 2010 20:46:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932435Ab0AGBqM (ORCPT ); Wed, 6 Jan 2010 20:46:12 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:60267 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932276Ab0AGBqM (ORCPT ); Wed, 6 Jan 2010 20:46:12 -0500 Date: Wed, 6 Jan 2010 18:59:11 -0200 From: Arnaldo Carvalho de Melo To: Miles Bader Cc: linux-kernel@vger.kernel.org Subject: Re: tools/perf: "perf record" restricted to root in latest kernel? Message-ID: <20100106205911.GC18919@ghostprotocols.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.20 (2009-08-17) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2902 Lines: 71 Em Wed, Jan 06, 2010 at 02:32:17PM +0900, Miles Bader escreveu: > I tried compiling tools/perf in an old linux source tree (ab86e5765, > roughly 2.6.31), and the resulting perf tool seemed to work fine > ("perf record" ... "perf report", "perf stat" etc); I ran it as an > ordinary user. > > Next I updated to the latest linus tree (c5974b835a), and recompiled perf. > It still seems to work, and has obviously had a lot of features added, but > now it only wants to let me run "perf record" if I'm root. This is > slightly annoying -- even if I use "sudo" or make it setuid, it still ends > up generating an output file owned by root, etc. > > In both cases, I'm using the same kernel (I only recompiled the tool), 2.6.32. > > I used no options with "perf record", just gave the command I wanted to profile. > > Is there a reason why the newer version perf tool restricts "perf record" > to root, especially given that the older version still seems to work fine > as non-root? Don't recall noticing such problem, here it works just fine: [acme@doppio linux-2.6-tip]$ mkdir tmp [acme@doppio linux-2.6-tip]$ cd tmp [acme@doppio tmp]$ time perf record find ~/git/ > /dev/null [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.053 MB perf.data (~2312 samples) ] real 0m25.602s user 0m0.007s sys 0m0.020s [acme@doppio tmp]$ perf report | head -13 # Samples: 1628008142 # # Overhead Command Shared Object Symbol # ........ ....... ...................... ...... # 6.03% find libc-2.10.2.so [.] _IO_vfprintf_internal 5.70% find find [.] 0x0000000000351d 3.39% find [kernel] [k] ext4_htree_store_dirent 2.85% find [kernel] [k] __kmalloc 2.14% find [kernel] [k] _raw_spin_lock 2.10% find [kernel] [k] read_hpet 2.10% find [kernel] [k] half_md4_transform 2.08% find libc-2.10.2.so [.] __GI_memmove [acme@doppio tmp]$ perf report --sort dso # Samples: 1628008142 # # Overhead Shared Object # ........ ........................... # 74.66% [kernel] 16.74% libc-2.10.2.so 7.59% find 0.72% ld-2.10.2.so 0.29% libpthread-2.10.2.so [acme@doppio tmp]$ cd .. [acme@doppio linux-2.6-tip]$ uname -r 2.6.33-rc3-tip+ [acme@doppio linux-2.6-tip]$ git branch | grep ^\* * perf [acme@doppio linux-2.6-tip]$ cat .git/refs/heads/perf 1dcff0bf19619e4d7bc61628770e6d88c631015c [acme@doppio linux-2.6-tip]$ - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/