From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Michael Petlan <mpetlan@redhat.com>,
Song Liu <songliubraving@fb.com>, Ian Rogers <irogers@google.com>,
Stephane Eranian <eranian@google.com>,
Alexei Budankov <abudankov@huawei.com>,
Andi Kleen <ak@linux.intel.com>,
Adrian Hunter <adrian.hunter@intel.com>
Subject: [PATCH 08/15] perf tools: Allow mmap2 event to synthesize kernel image
Date: Mon, 14 Dec 2020 11:54:50 +0100 [thread overview]
Message-ID: <20201214105457.543111-9-jolsa@kernel.org> (raw)
In-Reply-To: <20201214105457.543111-1-jolsa@kernel.org>
Allow mmap2 event to synthesize kernel image,
so we can synthesize kernel build id data in
following changes.
It's enabled by new symbol_conf.buildid_mmap2
bool, which will be switched in following
changes.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/symbol_conf.h | 3 ++-
tools/perf/util/synthetic-events.c | 40 ++++++++++++++++++++----------
2 files changed, 29 insertions(+), 14 deletions(-)
diff --git a/tools/perf/util/symbol_conf.h b/tools/perf/util/symbol_conf.h
index b916afb95ec5..b18f9c8dbb75 100644
--- a/tools/perf/util/symbol_conf.h
+++ b/tools/perf/util/symbol_conf.h
@@ -42,7 +42,8 @@ struct symbol_conf {
report_block,
report_individual_block,
inline_name,
- disable_add2line_warn;
+ disable_add2line_warn,
+ buildid_mmap2;
const char *vmlinux_name,
*kallsyms_name,
*source_prefix,
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 297987c6960b..a5f271fa2ae4 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -991,11 +991,12 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
- size_t size;
+ union perf_event *event;
+ size_t size = symbol_conf.buildid_mmap2 ?
+ sizeof(event->mmap2) : sizeof(event->mmap);
struct map *map = machine__kernel_map(machine);
struct kmap *kmap;
int err;
- union perf_event *event;
if (map == NULL)
return -1;
@@ -1009,7 +1010,7 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
* available use this, and after it is use this as a fallback for older
* kernels.
*/
- event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
+ event = zalloc(size + machine->id_hdr_size);
if (event == NULL) {
pr_debug("Not enough memory synthesizing mmap event "
"for kernel modules\n");
@@ -1026,16 +1027,29 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
}
- size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
- "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
- size = PERF_ALIGN(size, sizeof(u64));
- event->mmap.header.type = PERF_RECORD_MMAP;
- event->mmap.header.size = (sizeof(event->mmap) -
- (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
- event->mmap.pgoff = kmap->ref_reloc_sym->addr;
- event->mmap.start = map->start;
- event->mmap.len = map->end - event->mmap.start;
- event->mmap.pid = machine->pid;
+ if (symbol_conf.buildid_mmap2) {
+ size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
+ "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
+ size = PERF_ALIGN(size, sizeof(u64));
+ event->mmap2.header.type = PERF_RECORD_MMAP2;
+ event->mmap2.header.size = (sizeof(event->mmap2) -
+ (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
+ event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
+ event->mmap2.start = map->start;
+ event->mmap2.len = map->end - event->mmap.start;
+ event->mmap2.pid = machine->pid;
+ } else {
+ size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
+ "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
+ size = PERF_ALIGN(size, sizeof(u64));
+ event->mmap.header.type = PERF_RECORD_MMAP;
+ event->mmap.header.size = (sizeof(event->mmap) -
+ (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
+ event->mmap.pgoff = kmap->ref_reloc_sym->addr;
+ event->mmap.start = map->start;
+ event->mmap.len = map->end - event->mmap.start;
+ event->mmap.pid = machine->pid;
+ }
err = perf_tool__process_synth_event(tool, event, machine, process);
free(event);
--
2.26.2
next prev parent reply other threads:[~2020-12-14 11:01 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 10:54 [PATCHv5 00/15] perf: Add mmap2 build id support Jiri Olsa
2020-12-14 10:54 ` [PATCH 01/15] bpf: Move stack_map_get_build_id into lib Jiri Olsa
2020-12-15 15:49 ` Arnaldo Carvalho de Melo
2020-12-14 10:54 ` [PATCH 02/15] bpf: Add size arg to build_id_parse function Jiri Olsa
2020-12-14 10:54 ` [PATCH 03/15] perf: Add build id data in mmap2 event Jiri Olsa
2020-12-15 15:52 ` Arnaldo Carvalho de Melo
2020-12-15 22:01 ` Daniel Borkmann
2020-12-25 22:35 ` Jiri Olsa
2020-12-28 13:56 ` Arnaldo Carvalho de Melo
2020-12-14 10:54 ` [PATCH 04/15] tools headers uapi: Sync tools/include/uapi/linux/perf_event.h Jiri Olsa
2020-12-14 10:54 ` [PATCH 05/15] perf tools: Do not swap mmap2 fields in case it contains build id Jiri Olsa
2020-12-14 10:54 ` [PATCH 06/15] perf tools: Add support to read build id from compressed elf Jiri Olsa
2020-12-15 15:55 ` Arnaldo Carvalho de Melo
2020-12-28 13:01 ` Arnaldo Carvalho de Melo
2020-12-14 10:54 ` [PATCH 07/15] perf tools: Store build id from mmap2 events Jiri Olsa
2020-12-14 10:54 ` Jiri Olsa [this message]
2020-12-14 10:54 ` [PATCH 09/15] perf tools: Allow mmap2 event to synthesize modules Jiri Olsa
2020-12-14 10:54 ` [PATCH 10/15] perf tools: Synthesize build id for kernel/modules/tasks Jiri Olsa
2020-12-14 10:54 ` [PATCH 11/15] perf tools: Add support to display build id for mmap2 events Jiri Olsa
2020-12-14 10:54 ` [PATCH 12/15] perf buildid-cache: Add support to add build ids from perf data Jiri Olsa
2020-12-14 10:54 ` [PATCH 13/15] perf buildid-cache: Add --debuginfod option Jiri Olsa
2020-12-15 15:53 ` Arnaldo Carvalho de Melo
2020-12-14 10:54 ` [PATCH 14/15] perf buildid-list: Add support for mmap2's buildid events Jiri Olsa
2020-12-14 10:54 ` [PATCH 15/15] perf record: Add --buildid-mmap option to enable mmap's build id Jiri Olsa
2020-12-28 13:44 ` Arnaldo Carvalho de Melo
2020-12-28 23:02 ` Jiri Olsa
2020-12-15 13:43 ` [PATCHv5 00/15] perf: Add mmap2 build id support Namhyung Kim
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