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/*-
* Copyright (c) 2014-2018 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_optrack_record_funcid --
* Allocate and record optrack function ID.
*/
void
__wt_optrack_record_funcid(
WT_SESSION_IMPL *session, const char *func, uint16_t *func_idp)
{
static uint16_t optrack_uid = 0; /* Unique for the process lifetime. */
WT_CONNECTION_IMPL *conn;
WT_DECL_ITEM(tmp);
WT_DECL_RET;
wt_off_t fsize;
bool locked;
conn = S2C(session);
locked = false;
WT_ERR(__wt_scr_alloc(session, strlen(func) + 32, &tmp));
__wt_spin_lock(session, &conn->optrack_map_spinlock);
locked = true;
if (*func_idp == 0) {
*func_idp = ++optrack_uid;
WT_ERR(__wt_buf_fmt(
session, tmp, "%" PRIu16 " %s\n", *func_idp, func));
WT_ERR(__wt_filesize(session, conn->optrack_map_fh, &fsize));
WT_ERR(__wt_write(session,
conn->optrack_map_fh, fsize, tmp->size, tmp->data));
}
if (0) {
err: WT_PANIC_MSG(session, ret,
"operation tracking initialization failure");
}
if (locked)
__wt_spin_unlock(session, &conn->optrack_map_spinlock);
__wt_scr_free(session, &tmp);
}
/*
* __optrack_open_file --
* Open the per-session operation-tracking file.
*/
static int
__optrack_open_file(WT_SESSION_IMPL *session)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_ITEM(buf);
WT_DECL_RET;
WT_OPTRACK_HEADER optrack_header = { WT_OPTRACK_VERSION, 0,
(uint32_t)WT_TSC_DEFAULT_RATIO * WT_THOUSAND };
conn = S2C(session);
if (!F_ISSET(conn, WT_CONN_OPTRACK))
WT_RET_MSG(session, WT_ERROR, "WT_CONN_OPTRACK not set");
WT_RET(__wt_scr_alloc(session, 0, &buf));
WT_ERR(__wt_filename_construct(session, conn->optrack_path,
"optrack", conn->optrack_pid, session->id, buf));
WT_ERR(__wt_open(session,
(const char *)buf->data, WT_FS_OPEN_FILE_TYPE_REGULAR,
WT_FS_OPEN_CREATE, &session->optrack_fh));
/* Indicate whether this is an internal session */
if (F_ISSET(session, WT_SESSION_INTERNAL))
optrack_header.optrack_session_internal = 1;
/*
* Record the clock ticks to nanoseconds ratio. Multiply it by one
* thousand, so we can use a fixed width integer.
*/
optrack_header.optrack_tsc_nsec_ratio =
(uint32_t)(__wt_process.tsc_nsec_ratio * WT_THOUSAND);
/* Write the header into the operation-tracking file. */
WT_ERR(session->optrack_fh->handle->fh_write(
session->optrack_fh->handle, (WT_SESSION *)session,
0, sizeof(WT_OPTRACK_HEADER), &optrack_header));
session->optrack_offset = sizeof(WT_OPTRACK_HEADER);
if (0) {
err: WT_TRET(__wt_close(session, &session->optrack_fh));
}
__wt_scr_free(session, &buf);
return (ret);
}
/*
* __wt_optrack_flush_buffer --
* Flush optrack buffer. Returns the number of bytes flushed to the file.
*/
void
__wt_optrack_flush_buffer(WT_SESSION_IMPL *s)
{
if (s->optrack_fh == NULL && __optrack_open_file(s) != 0)
return;
/*
* We're not using the standard write path deliberately, that's quite
* a bit of additional code (including atomic operations), and this
* work should be as light-weight as possible.
*/
if (s->optrack_fh->handle->fh_write(s->optrack_fh->handle,
(WT_SESSION *)s, (wt_off_t)s->optrack_offset,
s->optrackbuf_ptr * sizeof(WT_OPTRACK_RECORD), s->optrack_buf) == 0)
s->optrack_offset +=
s->optrackbuf_ptr * sizeof(WT_OPTRACK_RECORD);
}
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