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b9ae18aa | 1 | |
2 | /* | |
262a0e14 | 3 | * $Id$ |
b9ae18aa | 4 | * |
5 | * DEBUG: section 79 Squid-side Disk I/O functions. | |
6 | * AUTHOR: Robert Collins | |
7 | * | |
8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
9 | * ---------------------------------------------------------- | |
10 | * | |
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. | |
19 | * | |
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. | |
26ac0430 | 24 | * |
b9ae18aa | 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. | |
26ac0430 | 29 | * |
b9ae18aa | 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. | |
33 | * | |
34 | * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org> | |
35 | */ | |
36 | ||
f7f3304a | 37 | #include "squid-old.h" |
b9ae18aa | 38 | |
b9ae18aa | 39 | #include "DiskThreadsDiskFile.h" |
8822ebee AR |
40 | #include "DiskThreadsIOStrategy.h" |
41 | #include "fde.h" | |
42 | #include "mgr/Registration.h" | |
e4f1fdae | 43 | #include "StatCounters.h" |
b9ae18aa | 44 | /* for statfs */ |
45 | #include "Store.h" | |
8822ebee | 46 | |
b9ae18aa | 47 | |
b9ae18aa | 48 | void |
49 | DiskThreadsIOStrategy::init(void) | |
50 | { | |
51 | if (initialised) | |
52 | return; | |
53 | ||
04eb0689 | 54 | squidaio_ctrl_pool = memPoolCreate("aio_ctrl", sizeof(squidaio_ctrl_t)); |
b9ae18aa | 55 | |
b9ae18aa | 56 | initialised = true; |
e65c313f | 57 | |
58 | /* | |
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. | |
62 | */ | |
6fdc2d18 | 63 | |
26ac0430 | 64 | registerWithCacheManager(); |
b9ae18aa | 65 | } |
66 | ||
62ee09ca | 67 | void |
15fab853 | 68 | DiskThreadsIOStrategy::registerWithCacheManager(void) |
62ee09ca | 69 | { |
8822ebee | 70 | Mgr::RegisterAction("squidaio_counts", "Async IO Function Counters", |
d9fc6862 | 71 | aioStats, 0, 1); |
62ee09ca | 72 | } |
73 | ||
b9ae18aa | 74 | void |
75 | DiskThreadsIOStrategy::done(void) | |
76 | { | |
77 | if (!initialised) | |
78 | return; | |
79 | ||
d06925a4 | 80 | squidaio_shutdown(); |
81 | ||
b9ae18aa | 82 | delete squidaio_ctrl_pool; |
83 | ||
84 | squidaio_ctrl_pool = NULL; | |
85 | ||
86 | initialised = false; | |
87 | } | |
88 | ||
89 | int | |
90 | DiskThreadsIOStrategy::callback() | |
91 | { | |
92 | squidaio_result_t *resultp; | |
93 | squidaio_ctrl_t *ctrlp; | |
94 | int retval = 0; | |
95 | ||
96 | assert(initialised); | |
cb4185f1 | 97 | ++squidaio_counts.check_callback; |
b9ae18aa | 98 | |
99 | for (;;) { | |
100 | if ((resultp = squidaio_poll_done()) == NULL) | |
101 | break; | |
102 | ||
103 | ctrlp = (squidaio_ctrl_t *) resultp->data; | |
104 | ||
105 | switch (resultp->result_type) { | |
106 | ||
107 | case _AIO_OP_NONE: | |
108 | ||
b9ae18aa | 109 | case _AIO_OP_OPENDIR: |
110 | break; | |
111 | ||
112 | case _AIO_OP_OPEN: | |
113 | ++squidaio_counts.open_finish; | |
114 | break; | |
115 | ||
116 | case _AIO_OP_READ: | |
117 | ++squidaio_counts.read_finish; | |
118 | break; | |
119 | ||
120 | case _AIO_OP_WRITE: | |
121 | ++squidaio_counts.write_finish; | |
122 | break; | |
123 | ||
124 | case _AIO_OP_CLOSE: | |
125 | ++squidaio_counts.close_finish; | |
126 | break; | |
127 | ||
128 | case _AIO_OP_UNLINK: | |
129 | ++squidaio_counts.unlink_finish; | |
130 | break; | |
131 | ||
132 | case _AIO_OP_STAT: | |
133 | ++squidaio_counts.stat_finish; | |
134 | break; | |
135 | } | |
136 | ||
137 | if (ctrlp == NULL) | |
138 | continue; /* XXX Should not happen */ | |
139 | ||
140 | dlinkDelete(&ctrlp->node, &used_list); | |
141 | ||
142 | if (ctrlp->done_handler) { | |
350e2aec | 143 | AIOCB *done_callback = ctrlp->done_handler; |
b9ae18aa | 144 | void *cbdata; |
145 | ctrlp->done_handler = NULL; | |
146 | ||
147 | if (cbdataReferenceValidDone(ctrlp->done_handler_data, &cbdata)) { | |
148 | retval = 1; /* Return that we've actually done some work */ | |
350e2aec | 149 | done_callback(ctrlp->fd, cbdata, ctrlp->bufp, |
0cc4a8bc | 150 | ctrlp->result.aio_return, ctrlp->result.aio_errno); |
b9ae18aa | 151 | } else { |
152 | if (ctrlp->operation == _AIO_OPEN) { | |
153 | /* The open operation was aborted.. */ | |
154 | int fd = ctrlp->result.aio_return; | |
155 | ||
156 | if (fd >= 0) | |
157 | aioClose(fd); | |
158 | } | |
159 | } | |
160 | } | |
161 | ||
162 | /* free data if requested to aioWrite() */ | |
163 | if (ctrlp->free_func) | |
164 | ctrlp->free_func(ctrlp->bufp); | |
165 | ||
166 | /* free temporary read buffer */ | |
167 | if (ctrlp->operation == _AIO_READ) | |
168 | squidaio_xfree(ctrlp->bufp, ctrlp->len); | |
169 | ||
dc47f531 | 170 | squidaio_ctrl_pool->freeOne(ctrlp); |
b9ae18aa | 171 | } |
172 | ||
173 | return retval; | |
174 | } | |
175 | ||
176 | /* Flush all pending I/O */ | |
177 | void | |
178 | DiskThreadsIOStrategy::sync() | |
179 | { | |
180 | if (!initialised) | |
181 | return; /* nothing to do then */ | |
182 | ||
183 | /* Flush all pending operations */ | |
709873c3 | 184 | debugs(32, 2, "aioSync: flushing pending I/O operations"); |
b9ae18aa | 185 | |
186 | do { | |
187 | callback(); | |
188 | } while (squidaio_sync()); | |
189 | ||
709873c3 | 190 | debugs(32, 2, "aioSync: done"); |
b9ae18aa | 191 | } |
192 | ||
193 | DiskThreadsIOStrategy::DiskThreadsIOStrategy() : initialised (false) {} | |
194 | ||
195 | void | |
196 | DiskThreadsIOStrategy::aioStats(StoreEntry * sentry) | |
197 | { | |
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()); | |
b0465494 | 209 | squidaio_stats(sentry); |
b9ae18aa | 210 | } |
211 | ||
b9ae18aa | 212 | DiskThreadsIOStrategy DiskThreadsIOStrategy::Instance; |
213 | bool | |
214 | DiskThreadsIOStrategy::shedLoad() | |
215 | { | |
216 | /* | |
217 | * we should detect some 'too many files open' condition and return | |
218 | * NULL here. | |
219 | */ | |
220 | #ifdef MAGIC2 | |
221 | ||
222 | if (aioQueueSize() > MAGIC2) | |
223 | return true; | |
224 | ||
225 | #endif | |
226 | ||
227 | return false; | |
228 | } | |
229 | ||
230 | int | |
231 | DiskThreadsIOStrategy::load() | |
232 | { | |
233 | int loadav; | |
234 | int ql; | |
235 | ||
236 | ql = aioQueueSize(); | |
237 | ||
238 | if (ql == 0) | |
239 | loadav = 0; | |
240 | ||
241 | loadav = ql * 1000 / MAGIC1; | |
242 | ||
bf8fe701 | 243 | debugs(47, 9, "DiskThreadsIOStrategy::load: load=" << loadav); |
b9ae18aa | 244 | |
245 | return loadav; | |
246 | } | |
247 | ||
248 | DiskFile::Pointer | |
249 | DiskThreadsIOStrategy::newFile (char const *path) | |
250 | { | |
251 | if (shedLoad()) { | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | return new DiskThreadsDiskFile (path, this); | |
256 | } | |
257 | ||
c521ad17 DK |
258 | bool |
259 | DiskThreadsIOStrategy::unlinkdUseful() const | |
260 | { | |
261 | return false; | |
262 | } | |
263 | ||
b9ae18aa | 264 | void |
265 | DiskThreadsIOStrategy::unlinkFile(char const *path) | |
266 | { | |
e4f1fdae | 267 | ++statCounter.syscalls.disk.unlinks; |
b9ae18aa | 268 | aioUnlink(path, NULL, NULL); |
b9ae18aa | 269 | } |