From 9de89fe7c577847877ae00ea1aa6315559b10243 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 3 Feb 2010 16:52:00 -0200 Subject: perf symbols: Remove perf_session usage in symbols layer MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit I noticed while writing the first test in 'perf regtest' that to just test the symbol handling routines one needs to create a perf session, that is a layer centered on a perf.data file, events, etc, so I untied these layers. This reduces the complexity for the users as the number of parameters to most of the symbols and session APIs now was reduced while not adding more state to all the map instances by only having data that is needed to split the kernel (kallsyms and ELF symtab sections) maps and do vmlinux relocation on the main kernel map. Signed-off-by: Arnaldo Carvalho de Melo Cc: Frédéric Weisbecker Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Paul Mackerras LKML-Reference: <1265223128-11786-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar --- tools/perf/util/thread.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'tools/perf/util/thread.c') diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index 4a08dcf50b68..634b7f7140d5 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -282,14 +282,13 @@ size_t perf_session__fprintf(struct perf_session *self, FILE *fp) } struct symbol *map_groups__find_symbol(struct map_groups *self, - struct perf_session *session, enum map_type type, u64 addr, symbol_filter_t filter) { struct map *map = map_groups__find(self, type, addr); if (map != NULL) - return map__find_symbol(map, session, map->map_ip(map, addr), filter); + return map__find_symbol(map, map->map_ip(map, addr), filter); return NULL; } -- cgit v1.2.3 From faa5c5c36ec50bf43e39c7798ce9701e6b002db3 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Fri, 19 Feb 2010 23:02:07 -0200 Subject: perf tools: Don't use parent comm if not set at fork time MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As the parent comm then is worthless, confusing users about the thread where the sample really happened, leading to think that the sample happened in the parent, not where it really happened, in the children of a thread for which a PERF_RECORD_COMM event was not received. Signed-off-by: Arnaldo Carvalho de Melo Cc: Frédéric Weisbecker Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Paul Mackerras LKML-Reference: <1266627727-19715-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar --- tools/perf/util/thread.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) (limited to 'tools/perf/util/thread.c') diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index 634b7f7140d5..9e8995eaf2b6 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -36,7 +36,10 @@ int thread__set_comm(struct thread *self, const char *comm) if (self->comm) free(self->comm); self->comm = strdup(comm); - return self->comm ? 0 : -ENOMEM; + if (self->comm == NULL) + return -ENOMEM; + self->comm_set = true; + return 0; } int thread__comm_len(struct thread *self) @@ -255,11 +258,14 @@ int thread__fork(struct thread *self, struct thread *parent) { int i; - if (self->comm) - free(self->comm); - self->comm = strdup(parent->comm); - if (!self->comm) - return -ENOMEM; + if (parent->comm_set) { + if (self->comm) + free(self->comm); + self->comm = strdup(parent->comm); + if (!self->comm) + return -ENOMEM; + self->comm_set = true; + } for (i = 0; i < MAP__NR_TYPES; ++i) if (map_groups__clone(&self->mg, &parent->mg, i) < 0) -- cgit v1.2.3 From 3846df2e0a99a2bf10023de0e9c1496592012d4c Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Mon, 22 Feb 2010 16:15:39 -0300 Subject: perf symbols: Improve debugging information about symtab origins MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Be more clear about DSO long names and tell from which file kernel symbols were obtained, all in --verbose mode: [root@mica ~]# perf report -v > /dev/null Looking at the vmlinux_path (5 entries long) Using /lib/modules/2.6.33-rc8-tip-00777-g0918527-dirty/build/vmlinux for symbols [root@mica ~]# mv /lib/modules/2.6.33-rc8-tip-00777-g0918527-dirty/build/vmlinux /tmp/dd [root@mica ~]# perf report -v > /dev/null Looking at the vmlinux_path (5 entries long) Using /proc/kallsyms for symbols [root@mica ~]# Signed-off-by: Arnaldo Carvalho de Melo Cc: Frédéric Weisbecker Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Paul Mackerras LKML-Reference: <1266866139-6361-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar --- tools/perf/util/thread.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'tools/perf/util/thread.c') diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index 9e8995eaf2b6..c090654cb6c0 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -53,11 +53,6 @@ int thread__comm_len(struct thread *self) return self->comm_len; } -static const char *map_type__name[MAP__NR_TYPES] = { - [MAP__FUNCTION] = "Functions", - [MAP__VARIABLE] = "Variables", -}; - static size_t __map_groups__fprintf_maps(struct map_groups *self, enum map_type type, FILE *fp) { -- cgit v1.2.3 From 4385d580f2278abab6d336e52522e9a6f5452a11 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 26 Feb 2010 12:08:34 -0300 Subject: perf tools: Flush maps on COMM events MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Even though we don't register the counters until the child is right about to exec(), we're still going to get at least a few events while the fork()'d child is still executing 'perf' and in particular we're going to get the MMAP events. We can't distinguish the ones in the newly executed process because the PID will be the same. One way to solve this would be to have a PERF_RECORD_EXEC event, and when this is seen 'perf' can flush it's map cache. We can't use PERF_RECORD_COMM since that's generated by other things, not just exec(). Actually, thinking about it some more, using PERF_RECORD_COMM might be a good enough approximation. Signed-off-by: David S. Miller Signed-off-by: Arnaldo Carvalho de Melo Cc: Frédéric Weisbecker Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Paul Mackerras LKML-Reference: <1267196914-16238-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar --- tools/perf/util/thread.c | 34 ++++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) (limited to 'tools/perf/util/thread.c') diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index c090654cb6c0..21b92162282b 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -31,15 +31,41 @@ static struct thread *thread__new(pid_t pid) return self; } +static void map_groups__flush(struct map_groups *self) +{ + int type; + + for (type = 0; type < MAP__NR_TYPES; type++) { + struct rb_root *root = &self->maps[type]; + struct rb_node *next = rb_first(root); + + while (next) { + struct map *pos = rb_entry(next, struct map, rb_node); + next = rb_next(&pos->rb_node); + rb_erase(&pos->rb_node, root); + /* + * We may have references to this map, for + * instance in some hist_entry instances, so + * just move them to a separate list. + */ + list_add_tail(&pos->node, &self->removed_maps[pos->type]); + } + } +} + int thread__set_comm(struct thread *self, const char *comm) { + int err; + if (self->comm) free(self->comm); self->comm = strdup(comm); - if (self->comm == NULL) - return -ENOMEM; - self->comm_set = true; - return 0; + err = self->comm == NULL ? -ENOMEM : 0; + if (!err) { + self->comm_set = true; + map_groups__flush(&self->mg); + } + return err; } int thread__comm_len(struct thread *self) -- cgit v1.2.3