From nobody Wed Feb 11 08:12:14 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B01BBC6FD1D for ; Tue, 4 Apr 2023 21:01:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236199AbjDDVBs (ORCPT ); Tue, 4 Apr 2023 17:01:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38778 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235526AbjDDVBX (ORCPT ); Tue, 4 Apr 2023 17:01:23 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7552D59CD for ; Tue, 4 Apr 2023 14:01:09 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id w5-20020a253005000000b00aedd4305ff2so33527363ybw.13 for ; Tue, 04 Apr 2023 14:01:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680642068; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=wj0zFnOGjLX2H2pqmjaN/TPZtFXQJuNwPwp/XDMzHTQ=; b=hiCSSAyFc3Fefg1mJbZzl8j/FKOnlkPpEXx19zp0ly1BZRc/R9T9iunS1w2QWke9uR QegPENGF+aNbgBtFN5ccAzQM/H0SdPUksuLqsb4DXGeJH2NO4BffynfHt5I7WGX53yxM hhpFZYh+qirjfk5ZMbSMkqb6Xq8esuRteAXydbB0K20KolVT/d2OmlATTGe5JYHHdn/4 54kTcBj5o8fmek12N512sLdcRv4VAuhqwLbkkWCOxlczXiAiaqLjCJ3OCAM+/5Jd/AmL kQjdOuHqtVhq7/jRQ+1174d9KAvTWHbakVY49PeYYr0bXEatiy6a9mL2CN0N+PyIR4D/ ZOeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680642068; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=wj0zFnOGjLX2H2pqmjaN/TPZtFXQJuNwPwp/XDMzHTQ=; b=Nw2GV6+8OLcZCMGxkvcZzYNsLcTN/n9t5gCj/+CfZbLH+yZ7Lf+LTQYxG+EqaN/wly D+NDAvUMF6Q7mz6JTfCu4WgbGikAsGZKzSUyXsvs/tz0oFgLE5JiPNdfMCLd2RSjHDhU btSHBkU2ZWN1I5TGTMCQQK6E98pykfER/+R1zGQakcFteO0dk48M0T3wZUwEtkEVjfQg sYQUL6ljzC+ftBl4KMAlR4l7GpJxDar9rSwj2uY8JjznU02TjFbbgh7h56Ky/Z7IVG7R YFsCMPIi3OToHqV5UluOuyebFhbYpKFo0CT42q+cWtSOEfCXyeQnMyXSxA2R4TZYNTio o9AA== X-Gm-Message-State: AAQBX9dHGC9vgyW9qw7Y+8qvR/NHAFzTIxRrDtzGQj4woR9tRK7xgqeB DFSwlQVBPMCKrFBxq0OC9MVJc6pEJhNM X-Google-Smtp-Source: AKy350ZcdHcdBTuvh0rSINk4xC5JyX/qIlqlYqW7u1+yruF7GiLKgVxMIlN1SDDSU7PcYPl1n2916BVQDBnD X-Received: from irogers.svl.corp.google.com ([2620:15c:2d4:203:a051:e074:d6f:dc29]) (user=irogers job=sendgmr) by 2002:a25:74d7:0:b0:b6d:1483:bc0f with SMTP id p206-20020a2574d7000000b00b6d1483bc0fmr2366307ybc.9.1680642068274; Tue, 04 Apr 2023 14:01:08 -0700 (PDT) Date: Tue, 4 Apr 2023 13:59:48 -0700 In-Reply-To: <20230404205954.2245628-1-irogers@google.com> Message-Id: <20230404205954.2245628-7-irogers@google.com> Mime-Version: 1.0 References: <20230404205954.2245628-1-irogers@google.com> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Subject: [PATCH v6 06/12] perf maps: Modify maps_by_name to hold a reference to a map From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Darren Hart , Davidlohr Bueso , James Clark , John Garry , Riccardo Mancini , Yury Norov , Andy Shevchenko , Andrew Morton , Adrian Hunter , Leo Yan , Andi Kleen , Thomas Richter , Kan Liang , Madhavan Srinivasan , Shunsuke Nakamura , Song Liu , Masami Hiramatsu , Steven Rostedt , Miaoqian Lin , Stephen Brennan , Kajol Jain , Alexey Bayduraev , German Gomez , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Eric Dumazet , Dmitry Vyukov , Hao Luo Cc: Stephane Eranian , Ian Rogers Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To make it clearer about the ownership of a reference count split the by-name case from the regular start-address sorted tree. Put the reference count when maps_by_name is freed, which requires moving a decrement to nr_maps in maps__remove. Add two missing map puts in maps__fixup_overlappings in the event maps__insert fails. Signed-off-by: Ian Rogers --- tools/perf/util/maps.c | 30 ++++++++++++++++-------------- tools/perf/util/symbol.c | 21 +++++++++++++++++---- 2 files changed, 33 insertions(+), 18 deletions(-) diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c index 0eee27e24c33..5afed53ea0b4 100644 --- a/tools/perf/util/maps.c +++ b/tools/perf/util/maps.c @@ -26,6 +26,9 @@ static void __maps__free_maps_by_name(struct maps *maps) /* * Free everything to try to do it from the rbtree in the next search */ + for (unsigned int i =3D 0; i < maps__nr_maps(maps); i++) + map__put(maps__maps_by_name(maps)[i]); + zfree(&maps->maps_by_name); maps->nr_maps_allocated =3D 0; } @@ -42,7 +45,7 @@ static int __maps__insert(struct maps *maps, struct map *= map) return -ENOMEM; =20 RB_CLEAR_NODE(&new_rb_node->rb_node); - new_rb_node->map =3D map; + new_rb_node->map =3D map__get(map); =20 while (*p !=3D NULL) { parent =3D *p; @@ -55,7 +58,6 @@ static int __maps__insert(struct maps *maps, struct map *= map) =20 rb_link_node(&new_rb_node->rb_node, parent, p); rb_insert_color(&new_rb_node->rb_node, maps__entries(maps)); - map__get(map); return 0; } =20 @@ -100,7 +102,7 @@ int maps__insert(struct maps *maps, struct map *map) maps->maps_by_name =3D maps_by_name; maps->nr_maps_allocated =3D nr_allocate; } - maps__maps_by_name(maps)[maps__nr_maps(maps) - 1] =3D map; + maps__maps_by_name(maps)[maps__nr_maps(maps) - 1] =3D map__get(map); __maps__sort_by_name(maps); } out: @@ -126,9 +128,9 @@ void maps__remove(struct maps *maps, struct map *map) rb_node =3D maps__find_node(maps, map); assert(rb_node->map =3D=3D map); __maps__remove(maps, rb_node); - --maps->nr_maps; if (maps__maps_by_name(maps)) __maps__free_maps_by_name(maps); + --maps->nr_maps; up_write(maps__lock(maps)); } =20 @@ -136,6 +138,9 @@ static void __maps__purge(struct maps *maps) { struct map_rb_node *pos, *next; =20 + if (maps__maps_by_name(maps)) + __maps__free_maps_by_name(maps); + maps__for_each_entry_safe(maps, pos, next) { rb_erase_init(&pos->rb_node, maps__entries(maps)); map__put(pos->map); @@ -293,7 +298,7 @@ int maps__fixup_overlappings(struct maps *maps, struct = map *map, FILE *fp) } =20 next =3D first; - while (next) { + while (next && !err) { struct map_rb_node *pos =3D rb_entry(next, struct map_rb_node, rb_node); next =3D rb_next(&pos->rb_node); =20 @@ -331,8 +336,10 @@ int maps__fixup_overlappings(struct maps *maps, struct= map *map, FILE *fp) =20 before->end =3D map__start(map); err =3D __maps__insert(maps, before); - if (err) + if (err) { + map__put(before); goto put_map; + } =20 if (verbose >=3D 2 && !use_browser) map__fprintf(before, fp); @@ -352,22 +359,17 @@ int maps__fixup_overlappings(struct maps *maps, struc= t map *map, FILE *fp) assert(map__map_ip(pos->map, map__end(map)) =3D=3D map__map_ip(after, map__end(map))); err =3D __maps__insert(maps, after); - if (err) + if (err) { + map__put(after); goto put_map; - + } if (verbose >=3D 2 && !use_browser) map__fprintf(after, fp); map__put(after); } put_map: map__put(pos->map); - - if (err) - goto out; } - - err =3D 0; -out: up_write(maps__lock(maps)); return err; } diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 7282119c2990..91ebf93e0c20 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -2053,10 +2053,23 @@ int dso__load(struct dso *dso, struct map *map) =20 static int map__strcmp(const void *a, const void *b) { - const struct dso *dso_a =3D map__dso(*(const struct map **)a); - const struct dso *dso_b =3D map__dso(*(const struct map **)b); + const struct map *map_a =3D *(const struct map **)a; + const struct map *map_b =3D *(const struct map **)b; + const struct dso *dso_a =3D map__dso(map_a); + const struct dso *dso_b =3D map__dso(map_b); + int ret =3D strcmp(dso_a->short_name, dso_b->short_name); =20 - return strcmp(dso_a->short_name, dso_b->short_name); + if (ret =3D=3D 0 && map_a !=3D map_b) { + /* + * Ensure distinct but name equal maps have an order in part to + * aid reference counting. + */ + ret =3D (int)map__start(map_a) - (int)map__start(map_b); + if (ret =3D=3D 0) + ret =3D (int)((intptr_t)map_a - (intptr_t)map_b); + } + + return ret; } =20 static int map__strcmp_name(const void *name, const void *b) @@ -2088,7 +2101,7 @@ static int map__groups__sort_by_name_from_rbtree(stru= ct maps *maps) maps->nr_maps_allocated =3D maps__nr_maps(maps); =20 maps__for_each_entry(maps, rb_node) - maps_by_name[i++] =3D rb_node->map; + maps_by_name[i++] =3D map__get(rb_node->map); =20 __maps__sort_by_name(maps); =20 --=20 2.40.0.348.gf938b09366-goog