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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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15
tools/perf/util/header.c
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@@ -237,11 +237,13 @@ static int dso__cache_build_id(struct dso *self, const char *debugdir)
char *filename = malloc(size),
*linkname = malloc(size), *targetname, *sbuild_id;
int len, err = -1;
bool is_kallsyms = self->kernel && self->long_name[0] != '/';
if (filename == NULL || linkname == NULL)
goto out_free;
len = snprintf(filename, size, "%s%s", debugdir, self->long_name);
len = snprintf(filename, size, "%s%s%s",
debugdir, is_kallsyms ? "/" : "", self->long_name);
if (mkdir_p(filename, 0755))
goto out_free;
@@ -249,9 +251,14 @@ static int dso__cache_build_id(struct dso *self, const char *debugdir)
sbuild_id = filename + len;
build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
if (access(filename, F_OK) && link(self->long_name, filename) &&
copyfile(self->long_name, filename))
goto out_free;
if (access(filename, F_OK)) {
if (is_kallsyms) {
if (copyfile("/proc/kallsyms", filename))
goto out_free;
} else if (link(self->long_name, filename) &&
copyfile(self->long_name, filename))
goto out_free;
}
len = snprintf(linkname, size, "%s/.build-id/%.2s",
debugdir, sbuild_id);