]>
git.ipfire.org Git - thirdparty/squid.git/blob - src/DiskIO/DiskThreads/DiskThreadsIOStrategy.cc
3 * $Id: DiskThreadsIOStrategy.cc,v 1.12 2007/04/28 22:26:47 hno Exp $
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 * ----------------------------------------------------------
11 * Squid is the result of efforts by numerous individuals from
12 * the Internet community; see the CONTRIBUTORS file for full
13 * details. Many organizations have provided support for Squid's
14 * development; see the SPONSORS file for full details. Squid is
15 * Copyrighted (C) 2001 by the Regents of the University of
16 * California; see the COPYRIGHT file for full details. Squid
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 "CacheManager.h"
40 #include "DiskThreadsIOStrategy.h"
41 #include "DiskThreadsDiskFile.h"
47 DiskThreadsIOStrategy::init(void)
52 squidaio_ctrl_pool
= memPoolCreate("aio_ctrl", sizeof(squidaio_ctrl_t
));
57 * We'd like to call squidaio_init() here, but the configuration
58 * hasn't been parsed yet and we don't know how many cache_dirs
59 * there are, which means we don't know how many threads to start.
62 registerWithCacheManager();
66 DiskThreadsIOStrategy::registerWithCacheManager(void)
68 CacheManager::GetInstance()->
69 registerAction("squidaio_counts", "Async IO Function Counters",
74 DiskThreadsIOStrategy::done(void)
81 delete squidaio_ctrl_pool
;
83 squidaio_ctrl_pool
= NULL
;
89 DiskThreadsIOStrategy::callback()
91 squidaio_result_t
*resultp
;
92 squidaio_ctrl_t
*ctrlp
;
96 squidaio_counts
.check_callback
++;
99 if ((resultp
= squidaio_poll_done()) == NULL
)
102 ctrlp
= (squidaio_ctrl_t
*) resultp
->data
;
104 switch (resultp
->result_type
) {
108 case _AIO_OP_OPENDIR
:
112 ++squidaio_counts
.open_finish
;
116 ++squidaio_counts
.read_finish
;
120 ++squidaio_counts
.write_finish
;
124 ++squidaio_counts
.close_finish
;
128 ++squidaio_counts
.unlink_finish
;
132 ++squidaio_counts
.stat_finish
;
137 continue; /* XXX Should not happen */
139 dlinkDelete(&ctrlp
->node
, &used_list
);
141 if (ctrlp
->done_handler
) {
142 AIOCB
*callback
= ctrlp
->done_handler
;
144 ctrlp
->done_handler
= NULL
;
146 if (cbdataReferenceValidDone(ctrlp
->done_handler_data
, &cbdata
)) {
147 retval
= 1; /* Return that we've actually done some work */
148 callback(ctrlp
->fd
, cbdata
, ctrlp
->bufp
,
149 ctrlp
->result
.aio_return
, ctrlp
->result
.aio_errno
);
151 if (ctrlp
->operation
== _AIO_OPEN
) {
152 /* The open operation was aborted.. */
153 int fd
= ctrlp
->result
.aio_return
;
161 /* free data if requested to aioWrite() */
162 if (ctrlp
->free_func
)
163 ctrlp
->free_func(ctrlp
->bufp
);
165 /* free temporary read buffer */
166 if (ctrlp
->operation
== _AIO_READ
)
167 squidaio_xfree(ctrlp
->bufp
, ctrlp
->len
);
169 squidaio_ctrl_pool
->free(ctrlp
);
175 /* Flush all pending I/O */
177 DiskThreadsIOStrategy::sync()
180 return; /* nothing to do then */
182 /* Flush all pending operations */
183 debugs(32, 1, "aioSync: flushing pending I/O operations");
187 } while (squidaio_sync());
189 debugs(32, 1, "aioSync: done");
192 DiskThreadsIOStrategy::DiskThreadsIOStrategy() : initialised (false) {}
195 DiskThreadsIOStrategy::aioStats(StoreEntry
* sentry
)
197 storeAppendPrintf(sentry
, "ASYNC IO Counters:\n");
198 storeAppendPrintf(sentry
, "Operation\t# Requests\tNumber serviced\n");
199 storeAppendPrintf(sentry
, "open\t%d\t%d\n", squidaio_counts
.open_start
, squidaio_counts
.open_finish
);
200 storeAppendPrintf(sentry
, "close\t%d\t%d\n", squidaio_counts
.close_start
, squidaio_counts
.close_finish
);
201 storeAppendPrintf(sentry
, "cancel\t%d\t-\n", squidaio_counts
.cancel
);
202 storeAppendPrintf(sentry
, "write\t%d\t%d\n", squidaio_counts
.write_start
, squidaio_counts
.write_finish
);
203 storeAppendPrintf(sentry
, "read\t%d\t%d\n", squidaio_counts
.read_start
, squidaio_counts
.read_finish
);
204 storeAppendPrintf(sentry
, "stat\t%d\t%d\n", squidaio_counts
.stat_start
, squidaio_counts
.stat_finish
);
205 storeAppendPrintf(sentry
, "unlink\t%d\t%d\n", squidaio_counts
.unlink_start
, squidaio_counts
.unlink_finish
);
206 storeAppendPrintf(sentry
, "check_callback\t%d\t-\n", squidaio_counts
.check_callback
);
207 storeAppendPrintf(sentry
, "queue\t%d\t-\n", squidaio_get_queue_len());
208 squidaio_stats(sentry
);
211 DiskThreadsIOStrategy
DiskThreadsIOStrategy::Instance
;
213 DiskThreadsIOStrategy::shedLoad()
216 * we should detect some 'too many files open' condition and return
221 if (aioQueueSize() > MAGIC2
)
230 DiskThreadsIOStrategy::load()
240 loadav
= ql
* 1000 / MAGIC1
;
242 debugs(47, 9, "DiskThreadsIOStrategy::load: load=" << loadav
);
248 DiskThreadsIOStrategy::newFile (char const *path
)
254 return new DiskThreadsDiskFile (path
, this);
258 DiskThreadsIOStrategy::unlinkFile(char const *path
)
260 statCounter
.syscalls
.disk
.unlinks
++;
261 aioUnlink(path
, NULL
, NULL
);