Commit 8d8c8e4c authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Arnaldo Carvalho de Melo
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perf buildid-cache: Add --purge FILE to remove all caches of FILE 



Add --purge FILE to remove all caches of FILE.

Since the current --remove FILE removes a cache which has
same build-id of given FILE. Since the command takes a
FILE path, it can confuse user who tries to remove cache
about FILE path.

  -----
  # ./perf buildid-cache -v --add ./perf
  Adding 133b7b5486d987a5ab5c3ebf4ea14941f45d4d4f ./perf: Ok
  # (update the ./perf binary)
  # ./perf buildid-cache -v --remove ./perf
  Removing 305bbd1be68f66eca7e2d78db294653031edfa79 ./perf: FAIL
  ./perf wasn't in the cache
  -----
Actually, the --remove's FAIL is not shown, it just silently fails.

So, this patch adds --purge FILE action for such usecase.

perf buildid-cache --purge FILE removes all caches which has same FILE
path.

In other words, it removes all caches including old binaries.

  -----
  # ./perf buildid-cache -v --add ./perf
  Adding 133b7b5486d987a5ab5c3ebf4ea14941f45d4d4f ./perf: Ok
  # (update the ./perf binary)
  # ./perf buildid-cache -v --purge ./perf
  Removing 133b7b5486d987a5ab5c3ebf4ea14941f45d4d4f ./perf: Ok
  -----

BTW, if you want to purge all the caches, remove ~/.debug/* .

Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20150227045026.1999.64084.stgit@localhost.localdomain


[ s/dirname/dir_name/g to fix build on fedora14, where dirname is a global ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 7335399a

tools/perf/Documentation/perf-buildid-cache.txt

+9 −4
Original line number Diff line number Diff line
@@ -12,9 +12,9 @@ SYNOPSIS 


DESCRIPTION

-----------

This command manages the build-id cache. It can add and remove files to/from

the cache. In the future it should as well purge older entries, set upper

limits for the space used by the cache, etc.

This command manages the build-id cache. It can add, remove, update and purge

files to/from the cache. In the future it should as well set upper limits for

the space used by the cache, etc.



OPTIONS

-------
@@ -36,7 +36,12 @@ OPTIONS 
        actually made.

-r::

--remove=::

        Remove specified file from the cache.

        Remove a cached binary which has same build-id of specified file

        from the cache.

-p::

--purge=::

        Purge all cached binaries including older caches which have specified

	path from the cache.

-M::

--missing=::

	List missing build ids in the cache for the specified file.

tools/perf/builtin-buildid-cache.c

+48 −0
Original line number Diff line number Diff line
@@ -223,6 +223,33 @@ static int build_id_cache__remove_file(const char *filename) 
	return err;

}



static int build_id_cache__purge_path(const char *pathname)

{

	struct strlist *list;

	struct str_node *pos;

	int err;



	err = build_id_cache__list_build_ids(pathname, &list);

	if (err)

		goto out;



	strlist__for_each(pos, list) {

		err = build_id_cache__remove_s(pos->s);

		if (verbose)

			pr_info("Removing %s %s: %s\n", pos->s, pathname,

				err ? "FAIL" : "Ok");

		if (err)

			break;

	}

	strlist__delete(list);



out:

	if (verbose)

		pr_info("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok");



	return err;

}



static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)

{

	char filename[PATH_MAX];
@@ -285,6 +312,7 @@ int cmd_buildid_cache(int argc, const char **argv, 
	bool force = false;

	char const *add_name_list_str = NULL,

		   *remove_name_list_str = NULL,

		   *purge_name_list_str = NULL,

		   *missing_filename = NULL,

		   *update_name_list_str = NULL,

		   *kcore_filename = NULL;
@@ -302,6 +330,8 @@ int cmd_buildid_cache(int argc, const char **argv, 
		   "file", "kcore file to add"),

	OPT_STRING('r', "remove", &remove_name_list_str, "file list",

		    "file(s) to remove"),

	OPT_STRING('p', "purge", &purge_name_list_str, "path list",

		    "path(s) to remove (remove old caches too)"),

	OPT_STRING('M', "missing", &missing_filename, "file",

		   "to find missing build ids in the cache"),

	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
@@ -368,6 +398,24 @@ int cmd_buildid_cache(int argc, const char **argv, 
		}

	}



	if (purge_name_list_str) {

		list = strlist__new(true, purge_name_list_str);

		if (list) {

			strlist__for_each(pos, list)

				if (build_id_cache__purge_path(pos->s)) {

					if (errno == ENOENT) {

						pr_debug("%s wasn't in the cache\n",

							 pos->s);

						continue;

					}

					pr_warning("Couldn't remove %s: %s\n",

						   pos->s, strerror_r(errno, sbuf, sizeof(sbuf)));

				}



			strlist__delete(list);

		}

	}



	if (missing_filename)

		ret = build_id_cache__fprintf_missing(session, stdout);

tools/perf/util/build-id.c

+76 −17
Original line number Diff line number Diff line
@@ -281,35 +281,93 @@ void disable_buildid_cache(void) 
	no_buildid_cache = true;

}



static char *build_id_cache__dirname_from_path(const char *name,

					       bool is_kallsyms, bool is_vdso)

{

	char *realname = (char *)name, *filename;

	bool slash = is_kallsyms || is_vdso;



	if (!slash) {

		realname = realpath(name, NULL);

		if (!realname)

			return NULL;

	}



	if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",

		     is_vdso ? DSO__NAME_VDSO : realname) < 0)

		filename = NULL;



	if (!slash)

		free(realname);



	return filename;

}



int build_id_cache__list_build_ids(const char *pathname,

				   struct strlist **result)

{

	struct strlist *list;

	char *dir_name;

	DIR *dir;

	struct dirent *d;

	int ret = 0;



	list = strlist__new(true, NULL);

	dir_name = build_id_cache__dirname_from_path(pathname, false, false);

	if (!list || !dir_name) {

		ret = -ENOMEM;

		goto out;

	}



	/* List up all dirents */

	dir = opendir(dir_name);

	if (!dir) {

		ret = -errno;

		goto out;

	}



	while ((d = readdir(dir)) != NULL) {

		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))

			continue;

		strlist__add(list, d->d_name);

	}

	closedir(dir);



out:

	free(dir_name);

	if (ret)

		strlist__delete(list);

	else

		*result = list;



	return ret;

}



int build_id_cache__add_s(const char *sbuild_id, const char *name,

			  bool is_kallsyms, bool is_vdso)

{

	const size_t size = PATH_MAX;

	char *realname, *filename = zalloc(size),

	char *realname = NULL, *filename = NULL, *dir_name = NULL,

	     *linkname = zalloc(size), *targetname, *tmp;

	int len, err = -1;

	bool slash = is_kallsyms || is_vdso;

	int err = -1;



	if (is_kallsyms) {

		if (symbol_conf.kptr_restrict) {

			pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");

			err = 0;

	if (!is_kallsyms) {

		realname = realpath(name, NULL);

		if (!realname)

			goto out_free;

	}

		realname = (char *) name;

	} else

		realname = realpath(name, NULL);



	if (realname == NULL || filename == NULL || linkname == NULL)

	dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);

	if (!dir_name)

		goto out_free;



	len = scnprintf(filename, size, "%s%s%s",

		       buildid_dir, slash ? "/" : "",

		       is_vdso ? DSO__NAME_VDSO : realname);

	if (mkdir_p(filename, 0755))

	if (mkdir_p(dir_name, 0755))

		goto out_free;



	snprintf(filename + len, size - len, "/%s", sbuild_id);

	if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) {

		filename = NULL;

		goto out_free;

	}



	if (access(filename, F_OK)) {

		if (is_kallsyms) {
@@ -337,6 +395,7 @@ out_free: 
	if (!is_kallsyms)

		free(realname);

	free(filename);

	free(dir_name);

	free(linkname);

	return err;

}

tools/perf/util/build-id.h

+3 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
#define BUILD_ID_SIZE 20



#include "tool.h"

#include "strlist.h"

#include <linux/types.h>



extern struct perf_tool build_id__mark_dso_hit_ops;
@@ -22,6 +23,8 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits); 
int perf_session__write_buildid_table(struct perf_session *session, int fd);

int perf_session__cache_build_ids(struct perf_session *session);



int build_id_cache__list_build_ids(const char *pathname,

				   struct strlist **result);

bool build_id_cache__cached(const char *sbuild_id);

int build_id_cache__add_s(const char *sbuild_id,

			  const char *name, bool is_kallsyms, bool is_vdso);

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