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perf symbols: Cache /proc/kallsyms files by build-id

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So that when we don't have a vmlinux handy we can store the
kallsyms for later use by 'perf report'.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1263501006-14185-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo
2010-01-14 18:30:06 -02:00
committed by Ingo Molnar
parent 8d0591f6ad
commit 9e201442de
5 changed files with 80 additions and 20 deletions
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30
tools/perf/util/util.c
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@ -32,6 +32,33 @@ int mkdir_p(char *path, mode_t mode)
return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
}
static int slow_copyfile(const char *from, const char *to)
{
int err = 0;
char *line = NULL;
size_t n;
FILE *from_fp = fopen(from, "r"), *to_fp;
if (from_fp == NULL)
goto out;
to_fp = fopen(to, "w");
if (to_fp == NULL)
goto out_fclose_from;
while (getline(&line, &n, from_fp) > 0)
if (fputs(line, to_fp) == EOF)
goto out_fclose_to;
err = 0;
out_fclose_to:
fclose(to_fp);
free(line);
out_fclose_from:
fclose(from_fp);
out:
return err;
}
int copyfile(const char *from, const char *to)
{
int fromfd, tofd;
@ -42,6 +69,9 @@ int copyfile(const char *from, const char *to)
if (stat(from, &st))
goto out;
if (st.st_size == 0) /* /proc? do it slowly... */
return slow_copyfile(from, to);
fromfd = open(from, O_RDONLY);
if (fromfd < 0)
goto out;