perf symbols: Cache /proc/kallsyms files by build-id
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>
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index f3c0798..f068584 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -32,6 +32,33 @@
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 @@
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;
