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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "spdk/stdinc.h"
#include "spdk/env.h"
#include "spdk/string.h"
#include "spdk/trace.h"
static int g_trace_fd = -1;
static char g_shm_name[64];
struct spdk_trace_histories *g_trace_histories;
void
_spdk_trace_record(uint64_t tsc, uint16_t tpoint_id, uint16_t poller_id, uint32_t size,
uint64_t object_id, uint64_t arg1)
{
struct spdk_trace_history *lcore_history;
struct spdk_trace_entry *next_entry;
unsigned lcore;
lcore = spdk_env_get_current_core();
if (lcore >= SPDK_TRACE_MAX_LCORE) {
return;
}
lcore_history = &g_trace_histories->per_lcore_history[lcore];
if (tsc == 0) {
tsc = spdk_get_ticks();
}
lcore_history->tpoint_count[tpoint_id]++;
next_entry = &lcore_history->entries[lcore_history->next_entry];
next_entry->tsc = tsc;
next_entry->tpoint_id = tpoint_id;
next_entry->poller_id = poller_id;
next_entry->size = size;
next_entry->object_id = object_id;
next_entry->arg1 = arg1;
lcore_history->next_entry++;
if (lcore_history->next_entry == SPDK_TRACE_SIZE) {
lcore_history->next_entry = 0;
}
}
int
spdk_trace_init(const char *shm_name)
{
int i = 0;
snprintf(g_shm_name, sizeof(g_shm_name), "%s", shm_name);
g_trace_fd = shm_open(shm_name, O_RDWR | O_CREAT, 0600);
if (g_trace_fd == -1) {
fprintf(stderr, "could not shm_open spdk_trace\n");
fprintf(stderr, "errno=%d %s\n", errno, spdk_strerror(errno));
return 1;
}
if (ftruncate(g_trace_fd, sizeof(*g_trace_histories)) != 0) {
fprintf(stderr, "could not truncate shm\n");
goto trace_init_err;
}
g_trace_histories = mmap(NULL, sizeof(*g_trace_histories), PROT_READ | PROT_WRITE,
MAP_SHARED, g_trace_fd, 0);
if (g_trace_histories == MAP_FAILED) {
fprintf(stderr, "could not mmap shm\n");
goto trace_init_err;
}
/* TODO: On FreeBSD, mlock on shm_open'd memory doesn't seem to work. Docs say that kern.ipc.shm_use_phys=1
* should allow it, but forcing that doesn't seem to work either. So for now just skip mlock on FreeBSD
* altogether.
*/
#if defined(__linux__)
if (mlock(g_trace_histories, sizeof(*g_trace_histories)) != 0) {
fprintf(stderr, "Could not mlock shm for tracing - %s.\n", spdk_strerror(errno));
if (errno == ENOMEM) {
fprintf(stderr, "Check /dev/shm for old tracing files that can be deleted.\n");
}
goto trace_init_err;
}
#endif
memset(g_trace_histories, 0, sizeof(*g_trace_histories));
g_trace_flags = &g_trace_histories->flags;
g_trace_flags->tsc_rate = spdk_get_ticks_hz();
for (i = 0; i < SPDK_TRACE_MAX_LCORE; i++) {
g_trace_histories->per_lcore_history[i].lcore = i;
}
spdk_trace_flags_init();
return 0;
trace_init_err:
if (g_trace_histories != MAP_FAILED) {
munmap(g_trace_histories, sizeof(*g_trace_histories));
}
close(g_trace_fd);
g_trace_fd = -1;
shm_unlink(shm_name);
g_trace_histories = NULL;
return 1;
}
void
spdk_trace_cleanup(void)
{
bool unlink;
if (g_trace_histories == NULL) {
return;
}
/*
* Only unlink the shm if there were no tracepoints enabled. This ensures the file
* can be used after this process exits/crashes for debugging.
* Note that we have to calculate this value before g_trace_histories gets unmapped.
*/
unlink = spdk_mem_all_zero(g_trace_flags->tpoint_mask, sizeof(g_trace_flags->tpoint_mask));
munmap(g_trace_histories, sizeof(struct spdk_trace_histories));
g_trace_histories = NULL;
close(g_trace_fd);
if (unlink) {
shm_unlink(g_shm_name);
}
}
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