From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Jiri Olsa <jolsa@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Cc: Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-perf-users@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Stephane Eranian <eranian@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Andi Kleen <ak@linux.intel.com>,
linux-trace-devel@vger.kernel.org,
linux-toolchains@vger.kernel.org
Subject: [PATCH 50/52] perf annotate-data: Track instructions with a this-cpu variable
Date: Thu, 9 Nov 2023 16:00:09 -0800 [thread overview]
Message-ID: <20231110000012.3538610-51-namhyung@kernel.org> (raw)
In-Reply-To: <20231110000012.3538610-1-namhyung@kernel.org>
Like global variables, this per-cpu variables should be tracked
correctly. Factor our get_global_var_type() to handle both global
and per-cpu (for this cpu) variables in the same manner.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/util/annotate-data.c | 84 +++++++++++++++++++++++----------
1 file changed, 60 insertions(+), 24 deletions(-)
diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c
index 56dfbddb53d2..416c0b5649fc 100644
--- a/tools/perf/util/annotate-data.c
+++ b/tools/perf/util/annotate-data.c
@@ -409,6 +409,37 @@ void update_var_state(struct type_state *state, struct data_loc_info *dloc,
}
}
+static bool get_global_var_type(Dwarf_Die *cu_die, struct map_symbol *ms, u64 ip,
+ u64 var_addr, const char *var_name, int var_offset,
+ Dwarf_Die *type_die)
+{
+ u64 pc;
+ int offset = var_offset;
+ bool is_pointer = false;
+ Dwarf_Die var_die;
+
+ pc = map__rip_2objdump(ms->map, ip);
+
+ /* Try to get the variable by address first */
+ if (die_find_variable_by_addr(cu_die, pc, var_addr, &var_die, &offset) &&
+ check_variable(&var_die, type_die, offset, is_pointer) == 0 &&
+ die_get_member_type(type_die, offset, type_die))
+ return true;
+
+ if (var_name == NULL)
+ return false;
+
+ offset = var_offset;
+
+ /* Try to get the name of global variable */
+ if (die_find_variable_at(cu_die, var_name, pc, &var_die) &&
+ check_variable(&var_die, type_die, offset, is_pointer) == 0 &&
+ die_get_member_type(type_die, offset, type_die))
+ return true;
+
+ return false;
+}
+
/**
* update_insn_state - Update type state for an instruction
* @state: type state table
@@ -472,14 +503,36 @@ void update_insn_state(struct type_state *state, struct data_loc_info *dloc,
fbreg = -1;
}
- /* Case 1. register to register transfers */
+ /* Case 1. register to register or segment:offset to register transfers */
if (!src->mem_ref && !dst->mem_ref) {
if (!has_reg_type(state, dst->reg1))
return;
if (has_reg_type(state, src->reg1))
state->regs[dst->reg1] = state->regs[src->reg1];
- else
+ else if (dloc->ms->map->dso->kernel &&
+ src->segment == INSN_SEG_X86_GS) {
+ struct map_symbol *ms = dloc->ms;
+ int offset = src->offset;
+ u64 ip = ms->sym->start + dl->al.offset;
+ const char *var_name = NULL;
+ u64 var_addr;
+
+ /*
+ * In kernel, %gs points to a per-cpu region for the
+ * current CPU. Access with a constant offset should
+ * be treated as a global variable access.
+ */
+ var_addr = src->offset;
+ get_percpu_var_info(dloc->thread, ms, dloc->cpumode,
+ var_addr, &var_name, &offset);
+
+ if (get_global_var_type(cu_die, ms, ip, var_addr,
+ var_name, offset, &type_die)) {
+ state->regs[dst->reg1].type = type_die;
+ state->regs[dst->reg1].ok = true;
+ }
+ } else
state->regs[dst->reg1].ok = false;
}
/* Case 2. memory to register transers */
@@ -492,37 +545,20 @@ void update_insn_state(struct type_state *state, struct data_loc_info *dloc,
retry:
/* Check if it's a global variable */
if (sreg == DWARF_REG_PC) {
- Dwarf_Die var_die;
struct map_symbol *ms = dloc->ms;
int offset = src->offset;
u64 ip = ms->sym->start + dl->al.offset;
- u64 pc, addr;
const char *var_name = NULL;
+ u64 var_addr;
- addr = annotate_calc_pcrel(ms, ip, offset, dl);
- pc = map__rip_2objdump(ms->map, ip);
-
- if (die_find_variable_by_addr(cu_die, pc, addr,
- &var_die, &offset) &&
- check_variable(&var_die, &type_die, offset,
- /*is_pointer=*/false) == 0 &&
- die_get_member_type(&type_die, offset, &type_die)) {
- state->regs[dst->reg1].type = type_die;
- state->regs[dst->reg1].ok = true;
- return;
- }
+ var_addr = annotate_calc_pcrel(ms, ip, offset, dl);
- /* Try to get the name of global variable */
- offset = src->offset;
get_global_var_info(dloc->thread, ms, ip, dl,
- dloc->cpumode, &addr,
+ dloc->cpumode, &var_addr,
&var_name, &offset);
- if (var_name && die_find_variable_at(cu_die, var_name,
- pc, &var_die) &&
- check_variable(&var_die, &type_die, offset,
- /*is_pointer=*/false) == 0 &&
- die_get_member_type(&type_die, offset, &type_die)) {
+ if (get_global_var_type(cu_die, ms, ip, var_addr,
+ var_name, offset, &type_die)) {
state->regs[dst->reg1].type = type_die;
state->regs[dst->reg1].ok = true;
} else
--
2.42.0.869.gea05f2083d-goog
next prev parent reply other threads:[~2023-11-10 0:04 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-09 23:59 [RFC 00/52] perf tools: Introduce data type profiling (v2) Namhyung Kim
2023-11-09 23:59 ` [PATCH 01/52] perf annotate: Pass "-l" option to objdump conditionally Namhyung Kim
2023-11-09 23:59 ` [PATCH 02/52] perf annotate: Move raw_comment and raw_func_start Namhyung Kim
2023-11-09 23:59 ` [PATCH 03/52] perf tools: Add util/debuginfo.[ch] files Namhyung Kim
2023-11-09 23:59 ` [PATCH 04/52] perf dwarf-aux: Fix die_get_typename() for void * Namhyung Kim
2023-11-09 23:59 ` [PATCH 05/52] perf dwarf-aux: Move #ifdef code to the header file Namhyung Kim
2023-11-09 23:59 ` [PATCH 06/52] perf dwarf-aux: Add die_get_scopes() helper Namhyung Kim
2023-11-09 23:59 ` [PATCH 07/52] perf dwarf-aux: Add die_find_variable_by_reg() helper Namhyung Kim
2023-11-09 23:59 ` [PATCH 08/52] perf build: Add feature check for dwarf_getcfi() Namhyung Kim
2023-11-10 10:26 ` Masami Hiramatsu
2023-11-09 23:59 ` [PATCH 09/52] perf probe: Convert to check dwarf_getcfi feature Namhyung Kim
2023-11-10 10:25 ` Masami Hiramatsu
2023-11-09 23:59 ` [PATCH 10/52] perf dwarf-aux: Factor out die_get_typename_from_type() Namhyung Kim
2023-11-09 23:59 ` [PATCH 11/52] perf dwarf-regs: Add get_dwarf_regnum() Namhyung Kim
2023-11-09 23:59 ` [PATCH 12/52] perf annotate-data: Add find_data_type() Namhyung Kim
[not found] ` <CA+JHD90fkWNrQWO5DrHeV8mCmFyKKqJ8fV=KwztRi7TSw+8yDg@mail.gmail.com>
2023-11-20 20:43 ` Namhyung Kim
2023-11-09 23:59 ` [PATCH 13/52] perf annotate-data: Add dso->data_types tree Namhyung Kim
2023-12-21 20:10 ` Arnaldo Carvalho de Melo
2023-12-21 20:13 ` Arnaldo Carvalho de Melo
2023-12-21 20:32 ` Arnaldo Carvalho de Melo
2023-11-09 23:59 ` [PATCH 14/52] perf annotate: Factor out evsel__get_arch() Namhyung Kim
2023-12-23 14:14 ` Arnaldo Carvalho de Melo
2023-11-09 23:59 ` [PATCH 15/52] perf annotate: Check if operand has multiple regs Namhyung Kim
2023-11-09 23:59 ` [PATCH 16/52] perf annotate: Add annotate_get_insn_location() Namhyung Kim
2023-11-09 23:59 ` [PATCH 17/52] perf annotate: Implement hist_entry__get_data_type() Namhyung Kim
2023-11-09 23:59 ` [PATCH 18/52] perf report: Add 'type' sort key Namhyung Kim
2023-11-21 17:55 ` Arnaldo Carvalho de Melo
2023-11-22 18:49 ` Namhyung Kim
2023-11-22 19:54 ` Arnaldo Carvalho de Melo
2023-11-22 21:13 ` Namhyung Kim
2023-11-23 13:40 ` Arnaldo Carvalho de Melo
2023-11-09 23:59 ` [PATCH 19/52] perf report: Support data type profiling Namhyung Kim
2023-11-09 23:59 ` [PATCH 20/52] perf annotate-data: Add member field in the data type Namhyung Kim
2023-11-09 23:59 ` [PATCH 21/52] perf annotate-data: Update sample histogram for type Namhyung Kim
2023-11-09 23:59 ` [PATCH 22/52] perf report: Add 'typeoff' sort key Namhyung Kim
2023-11-09 23:59 ` [PATCH 23/52] perf report: Add 'symoff' " Namhyung Kim
2023-12-23 14:29 ` Arnaldo Carvalho de Melo
2023-11-09 23:59 ` [PATCH 24/52] perf annotate: Add --data-type option Namhyung Kim
2023-11-09 23:59 ` [PATCH 25/52] perf annotate: Support event group display Namhyung Kim
2023-11-09 23:59 ` [PATCH 26/52] perf annotate: Add --type-stat option for debugging Namhyung Kim
2023-11-09 23:59 ` [PATCH 27/52] perf annotate: Add --insn-stat " Namhyung Kim
2023-11-09 23:59 ` [PATCH 28/52] perf annotate-data: Parse 'lock' prefix from llvm-objdump Namhyung Kim
2023-11-09 23:59 ` [PATCH 29/52] perf annotate-data: Handle macro fusion on x86 Namhyung Kim
2023-11-09 23:59 ` [PATCH 30/52] perf annotate-data: Handle array style accesses Namhyung Kim
2023-11-09 23:59 ` [PATCH 31/52] perf annotate-data: Add stack operation pseudo type Namhyung Kim
2023-11-09 23:59 ` [PATCH 32/52] perf dwarf-aux: Add die_find_variable_by_addr() Namhyung Kim
2023-11-27 22:07 ` Arnaldo Carvalho de Melo
2023-11-09 23:59 ` [PATCH 33/52] perf annotate-data: Handle PC-relative addressing Namhyung Kim
2023-11-09 23:59 ` [PATCH 34/52] perf annotate-data: Support global variables Namhyung Kim
2023-11-09 23:59 ` [PATCH 35/52] perf dwarf-aux: Add die_get_cfa() Namhyung Kim
2023-11-09 23:59 ` [PATCH 36/52] perf annotate-data: Support stack variables Namhyung Kim
2023-11-09 23:59 ` [PATCH 37/52] perf dwarf-aux: Check allowed DWARF Ops Namhyung Kim
2023-11-09 23:59 ` [PATCH 38/52] perf dwarf-aux: Add die_collect_vars() Namhyung Kim
2023-11-09 23:59 ` [PATCH 39/52] perf dwarf-aux: Handle type transfer for memory access Namhyung Kim
2023-11-09 23:59 ` [PATCH 40/52] perf annotate-data: Introduce struct data_loc_info Namhyung Kim
2023-11-10 0:00 ` [PATCH 41/52] perf map: Add map__objdump_2rip() Namhyung Kim
2023-11-10 0:00 ` [PATCH 42/52] perf annotate: Add annotate_get_basic_blocks() Namhyung Kim
2023-11-10 0:00 ` [PATCH 43/52] perf annotate-data: Maintain variable type info Namhyung Kim
2023-11-10 0:00 ` [PATCH 44/52] perf annotate-data: Add update_insn_state() Namhyung Kim
2023-11-10 0:00 ` [PATCH 45/52] perf annotate-data: Handle global variable access Namhyung Kim
2023-11-10 0:00 ` [PATCH 46/52] perf annotate-data: Handle call instructions Namhyung Kim
2023-11-10 0:00 ` [PATCH 47/52] perf annotate-data: Implement instruction tracking Namhyung Kim
2023-11-10 0:00 ` [PATCH 48/52] perf annotate: Parse x86 segment register location Namhyung Kim
2023-11-10 0:00 ` [PATCH 49/52] perf annotate-data: Handle this-cpu variables in kernel Namhyung Kim
2023-11-10 0:00 ` Namhyung Kim [this message]
2023-11-10 0:00 ` [PATCH 51/52] perf annotate-data: Add stack canary type Namhyung Kim
2023-11-10 0:00 ` [PATCH 52/52] perf annotate-data: Add debug message Namhyung Kim
2023-11-10 12:05 ` [RFC 00/52] perf tools: Introduce data type profiling (v2) Arnaldo Carvalho de Melo
2023-11-11 2:27 ` Namhyung Kim
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