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Message-Id: <20231207011722.1220634-7-irogers@google.com>
Date: Wed, 6 Dec 2023 17:16:40 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Nick Terrell <terrelln@...com>,
Kan Liang <kan.liang@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
Huacai Chen <chenhuacai@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Vincent Whitchurch <vincent.whitchurch@...s.com>,
"Steinar H. Gunderson" <sesse@...gle.com>,
Liam Howlett <liam.howlett@...cle.com>,
Miguel Ojeda <ojeda@...nel.org>,
Colin Ian King <colin.i.king@...il.com>,
Dmitrii Dolgov <9erthalion6@...il.com>,
Yang Jihong <yangjihong1@...wei.com>,
Ming Wang <wangming01@...ngson.cn>,
James Clark <james.clark@....com>,
K Prateek Nayak <kprateek.nayak@....com>,
Sean Christopherson <seanjc@...gle.com>,
Leo Yan <leo.yan@...aro.org>,
Ravi Bangoria <ravi.bangoria@....com>,
German Gomez <german.gomez@....com>,
Changbin Du <changbin.du@...wei.com>,
Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>,
Sandipan Das <sandipan.das@....com>,
liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org,
Guilherme Amadio <amadio@...too.org>
Subject: [PATCH v6 06/47] perf machine: Use function to add missing maps lock
Switch machine__map_x86_64_entry_trampolines and
machine__for_each_kernel_map from loop macro maps__for_each_entry to
maps__for_each_map function that takes a callback. The function holds
the maps lock, which should be held during iteration.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/util/machine.c | 53 +++++++++++++++++++++------------------
1 file changed, 29 insertions(+), 24 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index c5de5363b5e7..ca855fc435ac 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1285,33 +1285,46 @@ static u64 find_entry_trampoline(struct dso *dso)
#define X86_64_CPU_ENTRY_AREA_SIZE 0x2c000
#define X86_64_ENTRY_TRAMPOLINE 0x6000
+struct machine__map_x86_64_entry_trampolines_args {
+ struct maps *kmaps;
+ bool found;
+};
+
+static int machine__map_x86_64_entry_trampolines_cb(struct map *map, void *data)
+{
+ struct machine__map_x86_64_entry_trampolines_args *args = data;
+ struct map *dest_map;
+ struct kmap *kmap = __map__kmap(map);
+
+ if (!kmap || !is_entry_trampoline(kmap->name))
+ return 0;
+
+ dest_map = maps__find(args->kmaps, map__pgoff(map));
+ if (dest_map != map)
+ map__set_pgoff(map, map__map_ip(dest_map, map__pgoff(map)));
+
+ args->found = true;
+ return 0;
+}
+
/* Map x86_64 PTI entry trampolines */
int machine__map_x86_64_entry_trampolines(struct machine *machine,
struct dso *kernel)
{
- struct maps *kmaps = machine__kernel_maps(machine);
+ struct machine__map_x86_64_entry_trampolines_args args = {
+ .kmaps = machine__kernel_maps(machine),
+ .found = false,
+ };
int nr_cpus_avail, cpu;
- bool found = false;
- struct map_rb_node *rb_node;
u64 pgoff;
/*
* In the vmlinux case, pgoff is a virtual address which must now be
* mapped to a vmlinux offset.
*/
- maps__for_each_entry(kmaps, rb_node) {
- struct map *dest_map, *map = rb_node->map;
- struct kmap *kmap = __map__kmap(map);
-
- if (!kmap || !is_entry_trampoline(kmap->name))
- continue;
+ maps__for_each_map(args.kmaps, machine__map_x86_64_entry_trampolines_cb, &args);
- dest_map = maps__find(kmaps, map__pgoff(map));
- if (dest_map != map)
- map__set_pgoff(map, map__map_ip(dest_map, map__pgoff(map)));
- found = true;
- }
- if (found || machine->trampolines_mapped)
+ if (args.found || machine->trampolines_mapped)
return 0;
pgoff = find_entry_trampoline(kernel);
@@ -3398,16 +3411,8 @@ int machine__for_each_dso(struct machine *machine, machine__dso_t fn, void *priv
int machine__for_each_kernel_map(struct machine *machine, machine__map_t fn, void *priv)
{
struct maps *maps = machine__kernel_maps(machine);
- struct map_rb_node *pos;
- int err = 0;
- maps__for_each_entry(maps, pos) {
- err = fn(pos->map, priv);
- if (err != 0) {
- break;
- }
- }
- return err;
+ return maps__for_each_map(maps, fn, priv);
}
bool machine__is_lock_function(struct machine *machine, u64 addr)
--
2.43.0.rc2.451.g8631bc7472-goog
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