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Commit 2f3027ac authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf thread: Introduce method to set comm from /proc/pid/self 

Will be used for lazy comm loading in 'perf trace'.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-7ogbkuoka1y2qsmcckqxvl5m@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 4bd112df

tools/perf/util/thread.c

+19 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
#include "comm.h"

#include "unwind.h"



#include <api/fs/fs.h>



int thread__init_map_groups(struct thread *thread, struct machine *machine)

{

	struct thread *leader;
@@ -153,6 +155,23 @@ int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp, 
	return 0;

}



int thread__set_comm_from_proc(struct thread *thread)

{

	char path[64];

	char *comm = NULL;

	size_t sz;

	int err = -1;



	if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",

		       thread->pid_, thread->tid) >= (int)sizeof(path)) &&

	    procfs__read_str(path, &comm, &sz) == 0) {

		comm[sz - 1] = '\0';

		err = thread__set_comm(thread, comm, 0);

	}



	return err;

}



const char *thread__comm_str(const struct thread *thread)

{

	const struct comm *comm = thread__comm(thread);

tools/perf/util/thread.h

+2 −0
Original line number Diff line number Diff line
@@ -71,6 +71,8 @@ static inline int thread__set_comm(struct thread *thread, const char *comm, 
	return __thread__set_comm(thread, comm, timestamp, false);

}



int thread__set_comm_from_proc(struct thread *thread);



int thread__comm_len(struct thread *thread);

struct comm *thread__comm(const struct thread *thread);

struct comm *thread__exec_comm(const struct thread *thread);