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Message-Id: <1476207123-21791-4-git-send-email-acme@kernel.org>
Date: Tue, 11 Oct 2016 14:30:58 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org, Linux Weekly News <lwn@....net>,
Adrian Hunter <adrian.hunter@...el.com>,
Andi Kleen <ak@...ux.intel.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 03/68] perf intel-pt/bts: Tidy instruction buffer size usage
From: Adrian Hunter <adrian.hunter@...el.com>
Tidy instruction buffer size usage in preparation for copying the
instruction bytes onto samples.
The instruction buffer is presently used for debugging, so rename its
size macro from INTEL_PT_INSN_DBG_BUF_SZ to INTEL_PT_INSN_BUF_SZ, and
use it everywhere.
Note that the maximum instruction size is 15 which is a less efficient size
to copy than 16, which is why a separate buffer size is used.
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Link: http://lkml.kernel.org/r/1475847747-30994-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/intel-bts.c | 8 +++-----
tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c | 13 ++++++-------
tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.h | 6 ++----
tools/perf/util/intel-pt-decoder/intel-pt-log.c | 4 ++--
tools/perf/util/intel-pt.c | 8 +++-----
5 files changed, 16 insertions(+), 23 deletions(-)
diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index f545ec1e758a..8bc7fec817d7 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -319,15 +319,12 @@ static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
struct machine *machine = btsq->bts->machine;
struct thread *thread;
struct addr_location al;
- unsigned char buf[1024];
- size_t bufsz;
+ unsigned char buf[INTEL_PT_INSN_BUF_SZ];
ssize_t len;
int x86_64;
uint8_t cpumode;
int err = -1;
- bufsz = intel_pt_insn_max_size();
-
if (machine__kernel_ip(machine, ip))
cpumode = PERF_RECORD_MISC_KERNEL;
else
@@ -341,7 +338,8 @@ static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
if (!al.map || !al.map->dso)
goto out_put;
- len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf, bufsz);
+ len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf,
+ INTEL_PT_INSN_BUF_SZ);
if (len <= 0)
goto out_put;
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
index d23138c06665..5f95cd442075 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
@@ -27,6 +27,10 @@
#include "intel-pt-insn-decoder.h"
+#if INTEL_PT_INSN_BUF_SZ < MAX_INSN_SIZE
+#error Instruction buffer size too small
+#endif
+
/* Based on branch_type() from perf_event_intel_lbr.c */
static void intel_pt_insn_decoder(struct insn *insn,
struct intel_pt_insn *intel_pt_insn)
@@ -166,10 +170,10 @@ int intel_pt_get_insn(const unsigned char *buf, size_t len, int x86_64,
if (!insn_complete(&insn) || insn.length > len)
return -1;
intel_pt_insn_decoder(&insn, intel_pt_insn);
- if (insn.length < INTEL_PT_INSN_DBG_BUF_SZ)
+ if (insn.length < INTEL_PT_INSN_BUF_SZ)
memcpy(intel_pt_insn->buf, buf, insn.length);
else
- memcpy(intel_pt_insn->buf, buf, INTEL_PT_INSN_DBG_BUF_SZ);
+ memcpy(intel_pt_insn->buf, buf, INTEL_PT_INSN_BUF_SZ);
return 0;
}
@@ -211,11 +215,6 @@ int intel_pt_insn_desc(const struct intel_pt_insn *intel_pt_insn, char *buf,
return 0;
}
-size_t intel_pt_insn_max_size(void)
-{
- return MAX_INSN_SIZE;
-}
-
int intel_pt_insn_type(enum intel_pt_insn_op op)
{
switch (op) {
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.h b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.h
index b0adbf37323e..37ec5627ae9b 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.h
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.h
@@ -20,7 +20,7 @@
#include <stdint.h>
#define INTEL_PT_INSN_DESC_MAX 32
-#define INTEL_PT_INSN_DBG_BUF_SZ 16
+#define INTEL_PT_INSN_BUF_SZ 16
enum intel_pt_insn_op {
INTEL_PT_OP_OTHER,
@@ -47,7 +47,7 @@ struct intel_pt_insn {
enum intel_pt_insn_branch branch;
int length;
int32_t rel;
- unsigned char buf[INTEL_PT_INSN_DBG_BUF_SZ];
+ unsigned char buf[INTEL_PT_INSN_BUF_SZ];
};
int intel_pt_get_insn(const unsigned char *buf, size_t len, int x86_64,
@@ -58,8 +58,6 @@ const char *intel_pt_insn_name(enum intel_pt_insn_op op);
int intel_pt_insn_desc(const struct intel_pt_insn *intel_pt_insn, char *buf,
size_t buf_len);
-size_t intel_pt_insn_max_size(void);
-
int intel_pt_insn_type(enum intel_pt_insn_op op);
#endif
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-log.c b/tools/perf/util/intel-pt-decoder/intel-pt-log.c
index 319bef33a64b..e02bc7b166a0 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-log.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-log.c
@@ -119,8 +119,8 @@ void __intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
if (intel_pt_log_open())
return;
- if (len > INTEL_PT_INSN_DBG_BUF_SZ)
- len = INTEL_PT_INSN_DBG_BUF_SZ;
+ if (len > INTEL_PT_INSN_BUF_SZ)
+ len = INTEL_PT_INSN_BUF_SZ;
intel_pt_print_data(intel_pt_insn->buf, len, ip, 8);
if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
fprintf(f, "%s\n", desc);
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index dc041d4368c8..815a14d8904b 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -428,8 +428,7 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
struct machine *machine = ptq->pt->machine;
struct thread *thread;
struct addr_location al;
- unsigned char buf[1024];
- size_t bufsz;
+ unsigned char buf[INTEL_PT_INSN_BUF_SZ];
ssize_t len;
int x86_64;
u8 cpumode;
@@ -440,8 +439,6 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
if (to_ip && *ip == to_ip)
goto out_no_cache;
- bufsz = intel_pt_insn_max_size();
-
if (*ip >= ptq->pt->kernel_start)
cpumode = PERF_RECORD_MISC_KERNEL;
else
@@ -493,7 +490,8 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
while (1) {
len = dso__data_read_offset(al.map->dso, machine,
- offset, buf, bufsz);
+ offset, buf,
+ INTEL_PT_INSN_BUF_SZ);
if (len <= 0)
return -EINVAL;
--
2.7.4
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