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Message-Id: <20231102175735.2272696-52-irogers@google.com>
Date: Thu, 2 Nov 2023 10:57:33 -0700
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
Subject: [PATCH v4 51/53] perf dso: Reference counting related fixes
Ensure gets and puts are better aligned fixing reference couting
checking problems.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/util/machine.c | 4 ++--
tools/perf/util/map.c | 1 +
tools/perf/util/symbol-elf.c | 38 +++++++++++++++++-------------------
3 files changed, 21 insertions(+), 22 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index d4534fbc7098..bd1e2da5bb6d 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -683,7 +683,7 @@ static int machine__process_ksymbol_register(struct machine *machine,
struct perf_sample *sample __maybe_unused)
{
struct symbol *sym;
- struct dso *dso;
+ struct dso *dso = NULL;
struct map *map = maps__find(machine__kernel_maps(machine), event->ksymbol.addr);
int err = 0;
@@ -696,7 +696,6 @@ static int machine__process_ksymbol_register(struct machine *machine,
}
dso__set_kernel(dso, DSO_SPACE__KERNEL);
map = map__new2(0, dso);
- dso__put(dso);
if (!map) {
err = -ENOMEM;
goto out;
@@ -735,6 +734,7 @@ static int machine__process_ksymbol_register(struct machine *machine,
dso__insert_symbol(dso, sym);
out:
map__put(map);
+ dso__put(dso);
return err;
}
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 14fb8cf65b13..4480134ef4ea 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -200,6 +200,7 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
dso__set_build_id(dso, dso__bid(header_bid_dso));
dso__set_header_build_id(dso, 1);
}
+ dso__put(header_bid_dso);
}
dso__put(dso);
}
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index de73f9fb3fe4..4c00463abb7e 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1366,7 +1366,7 @@ void __weak arch__sym_update(struct symbol *s __maybe_unused,
static int dso__process_kernel_symbol(struct dso *dso, struct map *map,
GElf_Sym *sym, GElf_Shdr *shdr,
struct maps *kmaps, struct kmap *kmap,
- struct dso **curr_dsop, struct map **curr_mapp,
+ struct dso **curr_dsop,
const char *section_name,
bool adjust_kernel_syms, bool kmodule, bool *remap_kernel)
{
@@ -1416,8 +1416,8 @@ static int dso__process_kernel_symbol(struct dso *dso, struct map *map,
map__set_pgoff(map, shdr->sh_offset);
}
- *curr_mapp = map;
- *curr_dsop = dso;
+ dso__put(*curr_dsop);
+ *curr_dsop = dso__get(dso);
return 0;
}
@@ -1442,10 +1442,10 @@ static int dso__process_kernel_symbol(struct dso *dso, struct map *map,
dso__set_binary_type(curr_dso, dso__binary_type(dso));
dso__set_adjust_symbols(curr_dso, dso__adjust_symbols(dso));
curr_map = map__new2(start, curr_dso);
- dso__put(curr_dso);
- if (curr_map == NULL)
+ if (curr_map == NULL) {
+ dso__put(curr_dso);
return -1;
-
+ }
if (dso__kernel(curr_dso))
map__kmap(curr_map)->kmaps = kmaps;
@@ -1459,21 +1459,15 @@ static int dso__process_kernel_symbol(struct dso *dso, struct map *map,
dso__set_symtab_type(curr_dso, dso__symtab_type(dso));
if (maps__insert(kmaps, curr_map))
return -1;
- /*
- * Add it before we drop the reference to curr_map, i.e. while
- * we still are sure to have a reference to this DSO via
- * *curr_map->dso.
- */
dsos__add(&maps__machine(kmaps)->dsos, curr_dso);
- /* kmaps already got it */
- map__put(curr_map);
dso__set_loaded(curr_dso);
- *curr_mapp = curr_map;
+ dso__put(*curr_dsop);
*curr_dsop = curr_dso;
} else {
- *curr_dsop = map__dso(curr_map);
- map__put(curr_map);
+ dso__put(*curr_dsop);
+ *curr_dsop = dso__get(map__dso(curr_map));
}
+ map__put(curr_map);
return 0;
}
@@ -1484,8 +1478,7 @@ dso__load_sym_internal(struct dso *dso, struct map *map, struct symsrc *syms_ss,
{
struct kmap *kmap = dso__kernel(dso) ? map__kmap(map) : NULL;
struct maps *kmaps = kmap ? map__kmaps(map) : NULL;
- struct map *curr_map = map;
- struct dso *curr_dso = dso;
+ struct dso *curr_dso;
Elf_Data *symstrs, *secstrs, *secstrs_run, *secstrs_sym;
uint32_t nr_syms;
int err = -1;
@@ -1586,6 +1579,7 @@ dso__load_sym_internal(struct dso *dso, struct map *map, struct symsrc *syms_ss,
remap_kernel = true;
adjust_kernel_syms = dso__adjust_symbols(dso);
}
+ curr_dso = dso__get(dso);
elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
struct symbol *f;
const char *elf_name = elf_sym__name(&sym, symstrs);
@@ -1674,8 +1668,11 @@ dso__load_sym_internal(struct dso *dso, struct map *map, struct symsrc *syms_ss,
--sym.st_value;
if (dso__kernel(dso)) {
- if (dso__process_kernel_symbol(dso, map, &sym, &shdr, kmaps, kmap, &curr_dso, &curr_map,
- section_name, adjust_kernel_syms, kmodule, &remap_kernel))
+ if (dso__process_kernel_symbol(dso, map, &sym, &shdr,
+ kmaps, kmap, &curr_dso,
+ section_name,
+ adjust_kernel_syms,
+ kmodule, &remap_kernel))
goto out_elf_end;
} else if ((used_opd && runtime_ss->adjust_symbols) ||
(!used_opd && syms_ss->adjust_symbols)) {
@@ -1724,6 +1721,7 @@ dso__load_sym_internal(struct dso *dso, struct map *map, struct symsrc *syms_ss,
__symbols__insert(dso__symbols(curr_dso), f, dso__kernel(dso));
nr++;
}
+ dso__put(curr_dso);
/*
* For misannotated, zeroed, ASM function sizes.
--
2.42.0.869.gea05f2083d-goog
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