]>
git.ipfire.org Git - thirdparty/squid.git/blob - src/DiskIO/DiskThreads/DiskThreadsIOStrategy.cc
5 * DEBUG: section 79 Squid-side Disk I/O functions.
6 * AUTHOR: Robert Collins
8 * SQUID Web Proxy Cache http://www.squid-cache.org/
9 * ----------------------------------------------------------
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13 * details. Many organizations have provided support for Squid's
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15 * Copyrighted (C) 2001 by the Regents of the University of
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17 * incorporates software developed and/or copyrighted by other
18 * sources; see the CREDITS file for full details.
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; either version 2 of the License, or
23 * (at your option) any later version.
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 * GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with this program; if not, write to the Free Software
32 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
34 * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
39 #include "DiskThreadsDiskFile.h"
40 #include "DiskThreadsIOStrategy.h"
42 #include "mgr/Registration.h"
43 #include "StatCounters.h"
49 DiskThreadsIOStrategy::init(void)
54 squidaio_ctrl_pool
= memPoolCreate("aio_ctrl", sizeof(squidaio_ctrl_t
));
59 * We'd like to call squidaio_init() here, but the configuration
60 * hasn't been parsed yet and we don't know how many cache_dirs
61 * there are, which means we don't know how many threads to start.
64 registerWithCacheManager();
68 DiskThreadsIOStrategy::registerWithCacheManager(void)
70 Mgr::RegisterAction("squidaio_counts", "Async IO Function Counters",
75 DiskThreadsIOStrategy::done(void)
82 delete squidaio_ctrl_pool
;
84 squidaio_ctrl_pool
= NULL
;
90 DiskThreadsIOStrategy::callback()
92 squidaio_result_t
*resultp
;
93 squidaio_ctrl_t
*ctrlp
;
97 squidaio_counts
.check_callback
++;
100 if ((resultp
= squidaio_poll_done()) == NULL
)
103 ctrlp
= (squidaio_ctrl_t
*) resultp
->data
;
105 switch (resultp
->result_type
) {
109 case _AIO_OP_OPENDIR
:
113 ++squidaio_counts
.open_finish
;
117 ++squidaio_counts
.read_finish
;
121 ++squidaio_counts
.write_finish
;
125 ++squidaio_counts
.close_finish
;
129 ++squidaio_counts
.unlink_finish
;
133 ++squidaio_counts
.stat_finish
;
138 continue; /* XXX Should not happen */
140 dlinkDelete(&ctrlp
->node
, &used_list
);
142 if (ctrlp
->done_handler
) {
143 AIOCB
*done_callback
= ctrlp
->done_handler
;
145 ctrlp
->done_handler
= NULL
;
147 if (cbdataReferenceValidDone(ctrlp
->done_handler_data
, &cbdata
)) {
148 retval
= 1; /* Return that we've actually done some work */
149 done_callback(ctrlp
->fd
, cbdata
, ctrlp
->bufp
,
150 ctrlp
->result
.aio_return
, ctrlp
->result
.aio_errno
);
152 if (ctrlp
->operation
== _AIO_OPEN
) {
153 /* The open operation was aborted.. */
154 int fd
= ctrlp
->result
.aio_return
;
162 /* free data if requested to aioWrite() */
163 if (ctrlp
->free_func
)
164 ctrlp
->free_func(ctrlp
->bufp
);
166 /* free temporary read buffer */
167 if (ctrlp
->operation
== _AIO_READ
)
168 squidaio_xfree(ctrlp
->bufp
, ctrlp
->len
);
170 squidaio_ctrl_pool
->freeOne(ctrlp
);
176 /* Flush all pending I/O */
178 DiskThreadsIOStrategy::sync()
181 return; /* nothing to do then */
183 /* Flush all pending operations */
184 debugs(32, 2, "aioSync: flushing pending I/O operations");
188 } while (squidaio_sync());
190 debugs(32, 2, "aioSync: done");
193 DiskThreadsIOStrategy::DiskThreadsIOStrategy() : initialised (false) {}
196 DiskThreadsIOStrategy::aioStats(StoreEntry
* sentry
)
198 storeAppendPrintf(sentry
, "ASYNC IO Counters:\n");
199 storeAppendPrintf(sentry
, "Operation\t# Requests\tNumber serviced\n");
200 storeAppendPrintf(sentry
, "open\t%d\t%d\n", squidaio_counts
.open_start
, squidaio_counts
.open_finish
);
201 storeAppendPrintf(sentry
, "close\t%d\t%d\n", squidaio_counts
.close_start
, squidaio_counts
.close_finish
);
202 storeAppendPrintf(sentry
, "cancel\t%d\t-\n", squidaio_counts
.cancel
);
203 storeAppendPrintf(sentry
, "write\t%d\t%d\n", squidaio_counts
.write_start
, squidaio_counts
.write_finish
);
204 storeAppendPrintf(sentry
, "read\t%d\t%d\n", squidaio_counts
.read_start
, squidaio_counts
.read_finish
);
205 storeAppendPrintf(sentry
, "stat\t%d\t%d\n", squidaio_counts
.stat_start
, squidaio_counts
.stat_finish
);
206 storeAppendPrintf(sentry
, "unlink\t%d\t%d\n", squidaio_counts
.unlink_start
, squidaio_counts
.unlink_finish
);
207 storeAppendPrintf(sentry
, "check_callback\t%d\t-\n", squidaio_counts
.check_callback
);
208 storeAppendPrintf(sentry
, "queue\t%d\t-\n", squidaio_get_queue_len());
209 squidaio_stats(sentry
);
212 DiskThreadsIOStrategy
DiskThreadsIOStrategy::Instance
;
214 DiskThreadsIOStrategy::shedLoad()
217 * we should detect some 'too many files open' condition and return
222 if (aioQueueSize() > MAGIC2
)
231 DiskThreadsIOStrategy::load()
241 loadav
= ql
* 1000 / MAGIC1
;
243 debugs(47, 9, "DiskThreadsIOStrategy::load: load=" << loadav
);
249 DiskThreadsIOStrategy::newFile (char const *path
)
255 return new DiskThreadsDiskFile (path
, this);
259 DiskThreadsIOStrategy::unlinkdUseful() const
265 DiskThreadsIOStrategy::unlinkFile(char const *path
)
267 ++statCounter
.syscalls
.disk
.unlinks
;
268 aioUnlink(path
, NULL
, NULL
);