From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Stanislav Fomichev <sdf@fomichev.me>,
Song Liu <songliubraving@fb.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 05/12] perf tools: Read also the end of the kernel
Date: Fri, 3 May 2019 10:18:34 +0200 [thread overview]
Message-ID: <20190503081841.1908-6-jolsa@kernel.org> (raw)
In-Reply-To: <20190503081841.1908-1-jolsa@kernel.org>
We mark the end of kernel based on the first module,
but that could cover some bpf program maps. Reading
_etext symbol if it's present to get precise kernel
map end.
Link: http://lkml.kernel.org/n/tip-ynut991ttyyhvo1sbhlm4c42@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/machine.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 3c520baa198c..ad0205fbb506 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -924,7 +924,8 @@ const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
* symbol_name if it's not that important.
*/
static int machine__get_running_kernel_start(struct machine *machine,
- const char **symbol_name, u64 *start)
+ const char **symbol_name,
+ u64 *start, u64 *end)
{
char filename[PATH_MAX];
int i, err = -1;
@@ -949,6 +950,11 @@ static int machine__get_running_kernel_start(struct machine *machine,
*symbol_name = name;
*start = addr;
+
+ err = kallsyms__get_function_start(filename, "_etext", &addr);
+ if (!err)
+ *end = addr;
+
return 0;
}
@@ -1440,7 +1446,7 @@ int machine__create_kernel_maps(struct machine *machine)
struct dso *kernel = machine__get_kernel(machine);
const char *name = NULL;
struct map *map;
- u64 addr = 0;
+ u64 start = 0, end = ~0ULL;
int ret;
if (kernel == NULL)
@@ -1459,9 +1465,9 @@ int machine__create_kernel_maps(struct machine *machine)
"continuing anyway...\n", machine->pid);
}
- if (!machine__get_running_kernel_start(machine, &name, &addr)) {
+ if (!machine__get_running_kernel_start(machine, &name, &start, &end)) {
if (name &&
- map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map, name, addr)) {
+ map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map, name, start)) {
machine__destroy_kernel_maps(machine);
ret = -1;
goto out_put;
@@ -1471,16 +1477,19 @@ int machine__create_kernel_maps(struct machine *machine)
* we have a real start address now, so re-order the kmaps
* assume it's the last in the kmaps
*/
- machine__update_kernel_mmap(machine, addr, ~0ULL);
+ machine__update_kernel_mmap(machine, start, end);
}
if (machine__create_extra_kernel_maps(machine, kernel))
pr_debug("Problems creating extra kernel maps, continuing anyway...\n");
- /* update end address of the kernel map using adjacent module address */
- map = map__next(machine__kernel_map(machine));
- if (map)
- machine__set_kernel_mmap(machine, addr, map->start);
+ if (end == ~0ULL) {
+ /* update end address of the kernel map using adjacent module address */
+ map = map__next(machine__kernel_map(machine));
+ if (map)
+ machine__set_kernel_mmap(machine, start, map->start);
+ }
+
out_put:
dso__put(kernel);
return ret;
--
2.20.1
next prev parent reply other threads:[~2019-05-03 8:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-03 8:18 [PATCHv2 00/12] perf tools: Display eBPF code in intel_pt trace Jiri Olsa
2019-05-03 8:18 ` [PATCH 01/12] perf tools: Separate generic code in dso__data_file_size Jiri Olsa
2019-05-03 8:18 ` [PATCH 02/12] perf tools: Separate generic code in dso_cache__read Jiri Olsa
2019-05-03 8:18 ` [PATCH 03/12] perf tools: Simplify dso_cache__read function Jiri Olsa
2019-05-03 8:18 ` [PATCH 04/12] perf tools: Add bpf dso read and size hooks Jiri Olsa
2019-05-03 8:18 ` Jiri Olsa [this message]
2019-05-03 8:18 ` [PATCH 06/12] perf tools: Keep zero in pgoff bpf map Jiri Olsa
2019-05-03 8:18 ` [PATCH 07/12] perf script: Pad dso name for --call-trace Jiri Olsa
2019-05-06 21:38 ` Song Liu
2019-05-07 8:13 ` Jiri Olsa
2019-05-07 18:29 ` Song Liu
2019-05-08 7:40 ` Jiri Olsa
2019-05-03 8:18 ` [PATCH 08/12] perf tools: Preserve eBPF maps when loading kcore Jiri Olsa
2019-05-03 8:18 ` [PATCH 09/12] perf tests: Add map_groups__merge_in test Jiri Olsa
2019-05-03 8:18 ` [PATCH 10/12] perf script: Add --show-bpf-events to show eBPF related events Jiri Olsa
2019-05-06 21:42 ` Song Liu
2019-05-07 8:18 ` Jiri Olsa
2019-05-07 18:27 ` Song Liu
2019-05-03 8:18 ` [PATCH 11/12] perf script: Remove superfluous bpf event titles Jiri Olsa
2019-05-03 8:18 ` [PATCH 12/12] perf script: Add --show-all-events option Jiri Olsa
2019-05-06 21:46 ` [PATCHv2 00/12] perf tools: Display eBPF code in intel_pt trace Song Liu
-- strict thread matches above, loose matches on Subject: below --
2019-05-08 13:19 [PATCHv3 " Jiri Olsa
2019-05-08 13:20 ` [PATCH 05/12] perf tools: Read also the end of the kernel Jiri Olsa
2019-05-24 18:15 ` Arnaldo Carvalho de Melo
2019-05-24 18:17 ` Arnaldo Carvalho de Melo
2019-05-24 18:46 ` Arnaldo Carvalho de Melo
2019-05-26 13:09 ` Jiri Olsa
2019-05-24 23:21 ` Jiri Olsa
2019-04-16 16:01 [PATCH 00/12] perf tools: Display eBPF code in intel_pt trace Jiri Olsa
2019-04-16 16:01 ` [PATCH 05/12] perf tools: Read also the end of the kernel Jiri Olsa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190503081841.1908-6-jolsa@kernel.org \
--to=jolsa@kernel.org \
--cc=a.p.zijlstra@chello.nl \
--cc=acme@kernel.org \
--cc=adrian.hunter@intel.com \
--cc=ak@linux.intel.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=namhyung@kernel.org \
--cc=sdf@fomichev.me \
--cc=songliubraving@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).