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Hagen reported broken strings in python3 tracepoint scripts:
make PYTHON=python3
perf record -e sched:sched_switch -a -- sleep 5
perf script --gen-script py
perf script -s ./perf-script.py
[..]
sched__sched_switch 7 563231.759525792 0 swapper prev_comm=bytearray(b'swapper/7\x00\x00\x00\x00\x00\x00\x00'), prev_pid=0, prev_prio=120, prev_state=, next_comm=bytearray(b'mutex-thread-co\x00'),
The problem is in the is_printable_array function that does not take the
zero byte into account and claim such string as not printable, so the
code will create byte array instead of string.
Committer testing:
After this fix:
sched__sched_switch 3 484522.497072626 1158680 kworker/3:0-eve prev_comm=kworker/3:0, prev_pid=1158680, prev_prio=120, prev_state=I, next_comm=swapper/3, next_pid=0, next_prio=120
Sample: {addr=0, cpu=3, datasrc=84410401, datasrc_decode=N/A|SNP N/A|TLB N/A|LCK N/A, ip=18446744071841817196, period=1, phys_addr=0, pid=1158680, tid=1158680, time=484522497072626, transaction=0, values=[(0, 0)], weight=0}
sched__sched_switch 4 484522.497085610 1225814 perf prev_comm=perf, prev_pid=1225814, prev_prio=120, prev_state=, next_comm=migration/4, next_pid=30, next_prio=0
Sample: {addr=0, cpu=4, datasrc=84410401, datasrc_decode=N/A|SNP N/A|TLB N/A|LCK N/A, ip=18446744071841817196, period=1, phys_addr=0, pid=1225814, tid=1225814, time=484522497085610, transaction=0, values=[(0, 0)], weight=0}
Fixes: 249de6e074 ("perf script python: Fix string vs byte array resolving")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Hagen Paul Pfeifer <hagen@jauu.net>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200928201135.3633850-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "print_binary.h"
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#include <linux/log2.h>
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#include <linux/ctype.h>
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int binary__fprintf(unsigned char *data, size_t len,
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size_t bytes_per_line, binary__fprintf_t printer,
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void *extra, FILE *fp)
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{
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size_t i, j, mask;
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int printed = 0;
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if (!printer)
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return 0;
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bytes_per_line = roundup_pow_of_two(bytes_per_line);
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mask = bytes_per_line - 1;
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printed += printer(BINARY_PRINT_DATA_BEGIN, 0, extra, fp);
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for (i = 0; i < len; i++) {
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if ((i & mask) == 0) {
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printed += printer(BINARY_PRINT_LINE_BEGIN, -1, extra, fp);
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printed += printer(BINARY_PRINT_ADDR, i, extra, fp);
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}
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printed += printer(BINARY_PRINT_NUM_DATA, data[i], extra, fp);
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if (((i & mask) == mask) || i == len - 1) {
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for (j = 0; j < mask-(i & mask); j++)
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printed += printer(BINARY_PRINT_NUM_PAD, -1, extra, fp);
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printer(BINARY_PRINT_SEP, i, extra, fp);
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for (j = i & ~mask; j <= i; j++)
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printed += printer(BINARY_PRINT_CHAR_DATA, data[j], extra, fp);
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for (j = 0; j < mask-(i & mask); j++)
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printed += printer(BINARY_PRINT_CHAR_PAD, i, extra, fp);
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printed += printer(BINARY_PRINT_LINE_END, -1, extra, fp);
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}
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}
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printed += printer(BINARY_PRINT_DATA_END, -1, extra, fp);
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return printed;
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}
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int is_printable_array(char *p, unsigned int len)
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{
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unsigned int i;
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if (!p || !len || p[len - 1] != 0)
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return 0;
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len--;
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for (i = 0; i < len && p[i]; i++) {
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if (!isprint(p[i]) && !isspace(p[i]))
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return 0;
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}
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return 1;
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}
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