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/*
* blktrace output analysis: generate a timeline & gather statistics
*
* Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "globals.h"
LIST_HEAD(pending_cs);
static void gen_c_list(struct io *c_iop, struct list_head *c_head)
{
struct io *iop;
struct list_head *p;
__list_for_each(p, &pending_cs) {
iop = list_entry(p, struct io, c_pending);
if (iop->t.device == c_iop->t.device)
continue;
if (dip_find_sec(iop->dip, IOP_D, BIT_START(iop)) == NULL)
continue;
__link(iop, c_iop);
if (ready_complete(iop, c_iop))
list_add_tail(&iop->f_head, c_head);
__unlink(iop, c_iop);
}
}
static void run_comp(struct io *c_iop, struct io *top, struct list_head *rmhd)
{
struct io *d_iop = dip_find_sec(c_iop->dip, IOP_D, BIT_START(c_iop));
update_blks(c_iop);
if (d_iop) {
__u64 d2c = tdelta(d_iop, c_iop);
update_d2c(d_iop, d2c);
latency_d2c(d_iop->dip, c_iop->t.time, d2c);
iostat_complete(d_iop, c_iop);
__link(d_iop, c_iop);
run_issue(d_iop, top, rmhd);
__unlink(d_iop, c_iop);
}
else {
LIST_HEAD(head);
struct io *iop;
struct list_head *p, *q;
gen_c_list(c_iop, &head);
list_for_each_safe(p, q, &head) {
iop = list_entry(p, struct io, f_head);
LIST_DEL(&iop->f_head);
dump_level++;
__link(iop, c_iop);
run_comp(iop, top, rmhd);
__unlink(iop, c_iop);
dump_level--;
}
}
dump_iop(per_io_ofp, c_iop, NULL, 0);
LIST_DEL(&c_iop->c_pending);
list_add_tail(&c_iop->f_head, rmhd);
}
static int ready_comp(struct io *c_iop,
__attribute__((__unused__)) struct io *top)
{
LIST_HEAD(head);
struct io *iop;
struct list_head *p, *q;
__u64 bl = c_iop->bytes_left;
gen_c_list(c_iop, &head);
list_for_each_safe(p, q, &head) {
iop = list_entry(p, struct io, f_head);
LIST_DEL(&iop->f_head);
__link(iop, c_iop);
if (ready_complete(iop, c_iop))
bl -= iop->bytes_left;
__unlink(iop, c_iop);
}
return bl == 0;
}
void trace_complete(struct io *c_iop)
{
if (!io_setup(c_iop, IOP_C)) {
io_release(c_iop);
return;
}
list_add_tail(&c_iop->c_pending, &pending_cs);
if (ready_complete(c_iop, c_iop)) {
dump_level = 0;
run_complete(c_iop);
}
else
add_retry(c_iop);
}
int retry_complete(struct io *c_iop)
{
if (!ready_complete(c_iop, c_iop))
return 0;
del_retry(c_iop);
run_complete(c_iop);
return 1;
}
int ready_complete(struct io *c_iop, struct io *top)
{
struct io *d_iop = dip_find_sec(c_iop->dip, IOP_D, BIT_START(c_iop));
if (d_iop) {
ASSERT(d_iop->t.bytes == c_iop->bytes_left);
return ready_issue(d_iop, top);
}
else
return ready_comp(c_iop, top);
}
void run_complete(struct io *c_iop)
{
LIST_HEAD(rmhd);
update_cregion(&all_regions, c_iop->t.time);
update_cregion(&c_iop->dip->regions, c_iop->t.time);
if (c_iop->pip)
update_cregion(&c_iop->pip->regions, c_iop->t.time);
run_comp(c_iop, c_iop, &rmhd);
if (per_io_ofp) fprintf(per_io_ofp, "\n");
release_iops(&rmhd);
}
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