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Fri, 12 Dec 2025 16:34:25 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 5OueFRFEPGnNOAAAD6G6ig (envelope-from ); Fri, 12 Dec 2025 16:34:25 +0000 Date: Fri, 12 Dec 2025 08:34:18 -0800 From: Tony Jones To: Ian Rogers Cc: James Clark , Namhyung Kim , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Alexander Shishkin , Jiri Olsa , Adrian Hunter , Howard Chu , Stephen Brennan , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: Re: [PATCH v1] perf addr2line: Add a libdw implementation Message-ID: References: <20251122093934.94971-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; MISSING_XM_UA(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FREEMAIL_CC(0.00)[linaro.org,kernel.org,infradead.org,redhat.com,linux.intel.com,intel.com,gmail.com,oracle.com,vger.kernel.org]; RCPT_COUNT_TWELVE(0.00)[13]; RCVD_TLS_ALL(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -4.30 On Thu, Dec 11, 2025 at 09:20:35PM -0800, Ian Rogers wrote: > Thanks Tony, those are great performance numbers! I'm wondering now: >  - do we want to land addr2line with libdw given the wrong file/line# > problems or wait for a fix? >  - do we want to make the addr2line configurable like with objdump [1] to > mitigate the problem above? I think we should spend a bit more time understanding the former before doing the later. If only to provide some documentation on why there is a deviance to explain the configurability. Tony -- Tony Jones SUSE Kernel Performance Team