Revision 511e19b9e2112463c33a744ecb8a798056074408 authored by Namhyung Kim on 19 December 2022, 20:17:30 UTC, committed by Arnaldo Carvalho de Melo on 21 December 2022, 17:52:39 UTC
The -L/--lock-filter option is to filter only given locks. The locks can be specified by address or name (if exists). $ sudo ./perf lock record -a sleep 1 $ sudo ./perf lock con -l contended total wait max wait avg wait address symbol 57 1.11 ms 42.83 us 19.54 us ffff9f4140059000 15 280.88 us 23.51 us 18.73 us ffffffff9d007a40 jiffies_lock 1 20.49 us 20.49 us 20.49 us ffffffff9d0d50c0 rcu_state 1 9.02 us 9.02 us 9.02 us ffff9f41759e9ba0 $ sudo ./perf lock con -L jiffies_lock,rcu_state contended total wait max wait avg wait type caller 15 280.88 us 23.51 us 18.73 us spinlock tick_sched_do_timer+0x93 1 20.49 us 20.49 us 20.49 us spinlock __softirqentry_text_start+0xeb $ sudo ./perf lock con -L ffff9f4140059000 contended total wait max wait avg wait type caller 38 779.40 us 42.83 us 20.51 us spinlock worker_thread+0x50 11 216.30 us 39.87 us 19.66 us spinlock queue_work_on+0x39 8 118.13 us 20.51 us 14.77 us spinlock kthread+0xe5 Committer testing: # uname -a Linux quaco 6.0.12-200.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Dec 8 17:15:53 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux # perf lock record ^C[ perf record: Woken up 1 times to write data ] # perf lock con -L jiffies_lock,rcu_state contended total wait max wait avg wait type caller # perf lock con contended total wait max wait avg wait type caller 1 9.06 us 9.06 us 9.06 us spinlock call_timer_fn+0x24 # perf lock con -L call ignore unknown symbol: call contended total wait max wait avg wait type caller 1 9.06 us 9.06 us 9.06 us spinlock call_timer_fn+0x24 # Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Blake Jones <blakejones@google.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <song@kernel.org> Cc: bpf@vger.kernel.org Link: https://lore.kernel.org/r/20221219201732.460111-5-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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gen_crc64table.c
// SPDX-License-Identifier: GPL-2.0
/*
* Generate lookup table for the table-driven CRC64 calculation.
*
* gen_crc64table is executed in kernel build time and generates
* lib/crc64table.h. This header is included by lib/crc64.c for
* the table-driven CRC64 calculation.
*
* See lib/crc64.c for more information about which specification
* and polynomial arithmetic that gen_crc64table.c follows to
* generate the lookup table.
*
* Copyright 2018 SUSE Linux.
* Author: Coly Li <colyli@suse.de>
*/
#include <inttypes.h>
#include <stdio.h>
#define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
#define CRC64_ROCKSOFT_POLY 0x9A6C9329AC4BC9B5ULL
static uint64_t crc64_table[256] = {0};
static uint64_t crc64_rocksoft_table[256] = {0};
static void generate_reflected_crc64_table(uint64_t table[256], uint64_t poly)
{
uint64_t i, j, c, crc;
for (i = 0; i < 256; i++) {
crc = 0ULL;
c = i;
for (j = 0; j < 8; j++) {
if ((crc ^ (c >> j)) & 1)
crc = (crc >> 1) ^ poly;
else
crc >>= 1;
}
table[i] = crc;
}
}
static void generate_crc64_table(uint64_t table[256], uint64_t poly)
{
uint64_t i, j, c, crc;
for (i = 0; i < 256; i++) {
crc = 0;
c = i << 56;
for (j = 0; j < 8; j++) {
if ((crc ^ c) & 0x8000000000000000ULL)
crc = (crc << 1) ^ poly;
else
crc <<= 1;
c <<= 1;
}
table[i] = crc;
}
}
static void output_table(uint64_t table[256])
{
int i;
for (i = 0; i < 256; i++) {
printf("\t0x%016" PRIx64 "ULL", table[i]);
if (i & 0x1)
printf(",\n");
else
printf(", ");
}
printf("};\n");
}
static void print_crc64_tables(void)
{
printf("/* this file is generated - do not edit */\n\n");
printf("#include <linux/types.h>\n");
printf("#include <linux/cache.h>\n\n");
printf("static const u64 ____cacheline_aligned crc64table[256] = {\n");
output_table(crc64_table);
printf("\nstatic const u64 ____cacheline_aligned crc64rocksofttable[256] = {\n");
output_table(crc64_rocksoft_table);
}
int main(int argc, char *argv[])
{
generate_crc64_table(crc64_table, CRC64_ECMA182_POLY);
generate_reflected_crc64_table(crc64_rocksoft_table, CRC64_ROCKSOFT_POLY);
print_crc64_tables();
return 0;
}
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