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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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97ea1a7fa6
This reverts commit 9a92b479b2 ("perf
tools: Improve thread comm resolution in perf sched") and fixes the
real bug.
The bug was elsewhere:
We are failing to resolve thread names in perf sched because the
table of threads we are building, on top of comm events, has a per
process granularity. But perf sched, unlike the other perf tools,
needs a per thread granularity as we are profiling every tasks
individually.
So fix it by building our threads table using the tid instead of
the pid as the thread identifier.
v2: Revert the previous fix - it is not really needed
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1255028657-11158-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
#ifndef __PERF_THREAD_H
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#define __PERF_THREAD_H
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#include <linux/rbtree.h>
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#include <unistd.h>
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#include "symbol.h"
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struct thread {
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struct rb_node rb_node;
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struct rb_root maps;
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struct list_head removed_maps;
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pid_t pid;
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char shortname[3];
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char *comm;
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};
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int thread__set_comm(struct thread *self, const char *comm);
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struct thread *
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threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match);
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struct thread *
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register_idle_thread(struct rb_root *threads, struct thread **last_match);
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void thread__insert_map(struct thread *self, struct map *map);
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int thread__fork(struct thread *self, struct thread *parent);
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size_t threads__fprintf(FILE *fp, struct rb_root *threads);
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void maps__insert(struct rb_root *maps, struct map *map);
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struct map *maps__find(struct rb_root *maps, u64 ip);
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struct symbol *kernel_maps__find_symbol(const u64 ip, struct map **mapp);
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struct map *kernel_maps__find_by_dso_name(const char *name);
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static inline struct map *thread__find_map(struct thread *self, u64 ip)
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{
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return self ? maps__find(&self->maps, ip) : NULL;
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}
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#endif /* __PERF_THREAD_H */
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