From 4a0f65c102ec3a718b4a0b90981232b6cb019477 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Fri, 1 Jul 2016 17:03:36 +0900 Subject: [PATCH] perf probe: Remove caches when --cache is given 'perf probe --del' removes caches when '--cache' is given. Note that the delete pattern is not the same as for normal events. If you cached probes with event name, --del "eventname" works as expected. However, if you skipped it, the cached probes doesn't have actual event name. In that case --del "probe-desc" is required (wildcard is acceptable). For example a cache entry has the probe-desc "vfs_read $params", you can remove it with --del 'vfs_read*'. ----- # perf probe --cache --list /[kernel.kallsyms] (1466a0a250b5d0070c6d0f03c5fed30b237970a1): vfs_read $params /usr/lib64/libc-2.17.so (c31ffe7942bfd77b2fca8f9bd5709d387a86d3bc): getaddrinfo $params # perf probe --cache --del vfs_read\* Removed cached event: probe:vfs_read # perf probe --cache --list /[kernel.kallsyms] (1466a0a250b5d0070c6d0f03c5fed30b237970a1): /usr/lib64/libc-2.17.so (c31ffe7942bfd77b2fca8f9bd5709d387a86d3bc): getaddrinfo $params ----- Signed-off-by: Masami Hiramatsu Signed-off-by: Masami Hiramatsu Tested-by: Arnaldo Carvalho de Melo Cc: Ananth N Mavinakayanahalli Cc: Brendan Gregg Cc: Hemant Kumar Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/146736021651.27797.10250879847070772920.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-probe.txt | 1 + tools/perf/builtin-probe.c | 29 ++++++++++++++++++++ tools/perf/util/probe-file.c | 36 +++++++++++++++++++------ tools/perf/util/probe-file.h | 2 ++ 4 files changed, 60 insertions(+), 8 deletions(-) diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt index 5a70d45015ea..8d091734d02c 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt @@ -116,6 +116,7 @@ OPTIONS (With --add) Cache the probes. Any events which successfully added are also stored in the cache file. (With --list) Show cached probes. + (With --del) Remove cached probes. --max-probes=NUM:: Set the maximum number of probe points for an event. Default is 128. diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c index 0bb9084bf6cf..a1a5cd1b8d60 100644 --- a/tools/perf/builtin-probe.c +++ b/tools/perf/builtin-probe.c @@ -363,6 +363,32 @@ out_cleanup: return ret; } +static int del_perf_probe_caches(struct strfilter *filter) +{ + struct probe_cache *cache; + struct strlist *bidlist; + struct str_node *nd; + int ret; + + bidlist = build_id_cache__list_all(); + if (!bidlist) { + ret = -errno; + pr_debug("Failed to get buildids: %d\n", ret); + return ret ?: -ENOMEM; + } + + strlist__for_each_entry(nd, bidlist) { + cache = probe_cache__new(nd->s); + if (!cache) + continue; + if (probe_cache__filter_purge(cache, filter) < 0 || + probe_cache__commit(cache) < 0) + pr_warning("Failed to remove entries for %s\n", nd->s); + probe_cache__delete(cache); + } + return 0; +} + static int perf_del_probe_events(struct strfilter *filter) { int ret, ret2, ufd = -1, kfd = -1; @@ -375,6 +401,9 @@ static int perf_del_probe_events(struct strfilter *filter) pr_debug("Delete filter: \'%s\'\n", str); + if (probe_conf.cache) + return del_perf_probe_caches(filter); + /* Get current event names */ ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); if (ret < 0) diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c index 156e3d883965..6cb6ec03c1fe 100644 --- a/tools/perf/util/probe-file.c +++ b/tools/perf/util/probe-file.c @@ -684,20 +684,40 @@ out: return ret; } +static bool probe_cache_entry__compare(struct probe_cache_entry *entry, + struct strfilter *filter) +{ + char buf[128], *ptr = entry->spev; + + if (entry->pev.event) { + snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event); + ptr = buf; + } + return strfilter__compare(filter, ptr); +} + +int probe_cache__filter_purge(struct probe_cache *pcache, + struct strfilter *filter) +{ + struct probe_cache_entry *entry, *tmp; + + list_for_each_entry_safe(entry, tmp, &pcache->entries, node) { + if (probe_cache_entry__compare(entry, filter)) { + pr_info("Removed cached event: %s\n", entry->spev); + list_del_init(&entry->node); + probe_cache_entry__delete(entry); + } + } + return 0; +} + static int probe_cache__show_entries(struct probe_cache *pcache, struct strfilter *filter) { struct probe_cache_entry *entry; - char buf[128], *ptr; list_for_each_entry(entry, &pcache->entries, node) { - if (entry->pev.event) { - ptr = buf; - snprintf(buf, 128, "%s:%s", - entry->pev.group, entry->pev.event); - } else - ptr = entry->spev; - if (strfilter__compare(filter, ptr)) + if (probe_cache_entry__compare(entry, filter)) printf("%s\n", entry->spev); } return 0; diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h index 0009b8a65a5c..0ed1fc563b77 100644 --- a/tools/perf/util/probe-file.h +++ b/tools/perf/util/probe-file.h @@ -38,6 +38,8 @@ int probe_cache__add_entry(struct probe_cache *pcache, int probe_cache__commit(struct probe_cache *pcache); void probe_cache__purge(struct probe_cache *pcache); void probe_cache__delete(struct probe_cache *pcache); +int probe_cache__filter_purge(struct probe_cache *pcache, + struct strfilter *filter); struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev); struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache, -- 2.20.1