1 /* Copyright 2005 Princeton University
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
10 * Redistributions in binary form must reproduce the above
11 copyright notice, this list of conditions and the following
12 disclaimer in the documentation and/or other materials provided
13 with the distribution.
15 * Neither the name of the copyright holder nor the names of its
16 contributors may be used to endorse or promote products derived
17 from this software without specific prior written permission.
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL PRINCETON
23 UNIVERSITY OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
24 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
25 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
26 OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
27 AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
29 WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 POSSIBILITY OF SUCH DAMAGE.
45 #include <sys/resource.h>
51 #include "planetlab.h"
53 #ifndef VC_NXC_RAW_SOCKET
54 # define VC_NXC_RAW_SOCKET 0x00000200ull
56 #ifndef VC_NXC_RAW_SEND
57 # define VC_NXC_RAW_SEND 0x00000400ull
59 #ifndef VC_NXF_LBACK_ALLOW
60 # define VC_NXF_LBACK_ALLOW 0x00000400ull
64 create_context(xid_t ctx, uint64_t bcaps)
66 struct vc_ctx_caps vc_caps;
67 struct vc_net_flags vc_nf;
68 struct vc_net_caps vc_ncaps;
69 uint32_t unshare_mask;
71 /* Create network context */
72 if (vc_net_create(ctx) == VC_NOCTX) {
78 /* Make the network context persistent */
79 vc_nf.mask = vc_nf.flagword = VC_NXF_PERSISTENT | VC_NXF_LBACK_ALLOW;
80 if (vc_set_nflags(ctx, &vc_nf))
83 /* Give it raw sockets capabilities */
84 vc_ncaps.ncaps = vc_ncaps.cmask = VC_NXC_RAW_ICMP | VC_NXC_RAW_SOCKET;
85 if (vc_set_ncaps(ctx, &vc_ncaps))
89 /* Create tag context */
90 if (vc_tag_create(ctx) == VC_NOCTX)
96 * Create context info - this sets the STATE_SETUP and STATE_INIT flags.
98 if (vc_ctx_create(ctx, 0) == VC_NOCTX)
101 /* Unshare the net namespace if the slice if requested in the local slice configuration */
102 unshare_mask = get_space_flag(ctx);
103 if (unshare_mask != 0) {
104 unshare(unshare_mask);
105 vc_set_namespace(ctx, unshare_mask);
108 /* Set capabilities - these don't take effect until SETUP flag is unset */
109 vc_caps.bcaps = bcaps;
110 vc_caps.bmask = ~0ULL; /* currently unused */
111 vc_caps.ccaps = 0; /* don't want any of these */
112 vc_caps.cmask = ~0ULL;
113 if (vc_set_ccaps(ctx, &vc_caps))
116 if (pl_setsched(ctx, 0, 1) < 0) {
117 PERROR("pl_setsched(%u)", ctx);
125 pl_setup_done(xid_t ctx)
127 struct vc_ctx_flags vc_flags;
129 /* unset SETUP flag - this allows other processes to migrate */
130 /* set the PERSISTENT flag - so the context doesn't vanish */
131 /* Don't clear the STATE_INIT flag, as that would make us the init task. */
132 vc_flags.mask = VC_VXF_STATE_SETUP|VC_VXF_PERSISTENT;
133 vc_flags.flagword = VC_VXF_PERSISTENT;
134 if (vc_set_cflags(ctx, &vc_flags))
140 #define RETRY_LIMIT 10
143 pl_chcontext(xid_t ctx, uint64_t bcaps, const struct sliver_resources *slr)
146 int net_migrated = 0;
148 if (pl_set_ulimits(slr) != 0)
153 struct vc_ctx_flags vc_flags;
155 if (vc_get_cflags(ctx, &vc_flags))
160 /* context doesn't exist - create it */
161 if (create_context(ctx, bcaps))
164 /* another process beat us in a race */
167 /* another process is creating - poll the SETUP flag */
172 /* created context and migrated to it i.e., we're done */
176 /* check the SETUP flag */
177 if (vc_flags.flagword & VC_VXF_STATE_SETUP)
179 /* context is still being setup - wait a while then retry */
180 if (retry_count++ >= RETRY_LIMIT)
189 /* context has been setup */
191 if (net_migrated || !vc_net_migrate(ctx))
193 uint32_t unshare_mask;
194 /* Unshare the net namespace if the slice if requested in the local slice configuration */
195 unshare_mask = get_space_flag(ctx);
196 if (unshare_mask != 0) {
197 vc_enter_namespace(ctx, unshare_mask);
200 if (!vc_tag_migrate(ctx) && !vc_ctx_migrate(ctx, 0))
205 /* context disappeared - retry */
211 /* it's okay for a syscall to fail because the context doesn't exist */
212 #define VC_SYSCALL(x) \
216 return errno == ESRCH ? 0 : -1; \
221 pl_setsched(xid_t ctx, uint32_t cpu_min, uint32_t cpu_share)
223 struct vc_set_sched vc_sched;
224 struct vc_ctx_flags vc_flags;
226 vc_sched.set_mask = (VC_VXSM_FILL_RATE | VC_VXSM_INTERVAL | VC_VXSM_TOKENS |
227 VC_VXSM_TOKENS_MIN | VC_VXSM_TOKENS_MAX | VC_VXSM_MSEC |
228 VC_VXSM_FILL_RATE2 | VC_VXSM_INTERVAL2 | VC_VXSM_FORCE);
229 vc_sched.fill_rate = cpu_min; /* percent reserved */
230 vc_sched.interval = 100;
231 vc_sched.fill_rate2 = cpu_share; /* best-effort fair share of unreserved */
232 vc_sched.interval2 = 1000; /* milliseconds */
233 vc_sched.tokens = 100; /* initial allocation of tokens */
234 vc_sched.tokens_min = 50; /* need this many tokens to run */
235 vc_sched.tokens_max = 100; /* max accumulated number of tokens */
238 if (cpu_share == (uint32_t)VC_LIM_KEEP)
239 vc_sched.set_mask &= ~(VC_VXSM_FILL_RATE|VC_VXSM_FILL_RATE2);
241 vc_sched.set_mask |= VC_VXSM_IDLE_TIME;
244 VC_SYSCALL(vc_set_sched(ctx, &vc_sched));
246 vc_flags.mask = VC_VXF_SCHED_FLAGS;
247 vc_flags.flagword = VC_VXF_SCHED_HARD;
248 VC_SYSCALL(vc_set_cflags(ctx, &vc_flags));
258 struct pl_resources {
262 unsigned long long *limit;
263 unsigned long int *personality;
267 #define WHITESPACE(buffer,index,len) \
268 while(isspace((int)buffer[index])) \
269 if (index < len) index++; else goto out;
271 #define VSERVERCONF "/etc/vservers/"
274 pl_get_limits(const char *context, struct sliver_resources *slr)
278 size_t len = strlen(VSERVERCONF) + strlen(context) + NULLBYTE_SIZE;
279 char *conf = (char *)malloc(len + strlen("rlimits/openfd.hard"));
280 struct pl_resources *r;
281 struct pl_resources sliver_list[] = {
282 {"sched/fill-rate2", TYPE_LONG, &slr->vs_cpu},
284 {"rlimits/nproc.hard", TYPE_LONG, &slr->vs_nproc.hard},
285 {"rlimits/nproc.soft", TYPE_LONG, &slr->vs_nproc.soft},
286 {"rlimits/nproc.min", TYPE_LONG, &slr->vs_nproc.min},
288 {"rlimits/rss.hard", TYPE_LONG, &slr->vs_rss.hard},
289 {"rlimits/rss.soft", TYPE_LONG, &slr->vs_rss.soft},
290 {"rlimits/rss.min", TYPE_LONG, &slr->vs_rss.min},
292 {"rlimits/as.hard", TYPE_LONG, &slr->vs_as.hard},
293 {"rlimits/as.soft", TYPE_LONG, &slr->vs_as.soft},
294 {"rlimits/as.min", TYPE_LONG, &slr->vs_as.min},
296 {"rlimits/openfd.hard", TYPE_LONG, &slr->vs_openfd.hard},
297 {"rlimits/openfd.soft", TYPE_LONG, &slr->vs_openfd.soft},
298 {"rlimits/openfd.min", TYPE_LONG, &slr->vs_openfd.min},
300 {"personality", TYPE_PERS, &slr->personality},
305 sprintf(conf, "%s%s", VSERVERCONF, context);
307 slr->vs_rss.hard = VC_LIM_KEEP;
308 slr->vs_rss.soft = VC_LIM_KEEP;
309 slr->vs_rss.min = VC_LIM_KEEP;
311 slr->vs_as.hard = VC_LIM_KEEP;
312 slr->vs_as.soft = VC_LIM_KEEP;
313 slr->vs_as.min = VC_LIM_KEEP;
315 slr->vs_nproc.hard = VC_LIM_KEEP;
316 slr->vs_nproc.soft = VC_LIM_KEEP;
317 slr->vs_nproc.min = VC_LIM_KEEP;
319 slr->vs_openfd.hard = VC_LIM_KEEP;
320 slr->vs_openfd.soft = VC_LIM_KEEP;
321 slr->vs_openfd.min = VC_LIM_KEEP;
323 slr->personality = 0;
325 cwd = open(".", O_RDONLY);
327 perror("cannot get a handle on .");
330 if (chdir(conf) == -1) {
331 fprintf(stderr, "cannot chdir to ");
336 for (r = &sliver_list[0]; r->name; r++) {
338 fb = fopen(r->name, "r");
341 if (fgets(buf, sizeof(buf), fb) != NULL) {
343 /* remove trailing newline */
344 if (buf[len-1] == '\n') {
348 if ( (r->type == TYPE_LONG) && isdigit(*buf)) {
349 *r->limit = atoi(buf);
350 } else if ( (r->type == TYPE_PERS) && isalpha(*buf)) {
351 unsigned long int res;
352 res = vc_str2personalitytype(buf,len);
353 if (res != VC_BAD_PERSONALITY) {
354 *r->personality = res;
370 adjust_lim(const struct vc_rlimit *vcr, struct rlimit *lim)
373 if (vcr->min != VC_LIM_KEEP) {
374 if (vcr->min > lim->rlim_cur) {
375 lim->rlim_cur = vcr->min;
378 if (vcr->min > lim->rlim_max) {
379 lim->rlim_max = vcr->min;
384 if (vcr->soft != VC_LIM_KEEP) {
385 switch (vcr->min != VC_LIM_KEEP) {
387 if (vcr->soft < vcr->min)
390 lim->rlim_cur = vcr->soft;
395 if (vcr->hard != VC_LIM_KEEP) {
396 switch (vcr->min != VC_LIM_KEEP) {
398 if (vcr->hard < vcr->min)
401 lim->rlim_max = vcr->hard;
409 set_one_ulimit(int resource, const struct vc_rlimit *limit)
412 getrlimit(resource, &lim);
413 adjust_lim(limit, &lim);
414 setrlimit(resource, &lim);
418 set_personality(unsigned long int personality_arg)
420 if (personality_arg == 0)
422 if (personality(personality_arg) < 0) {
429 pl_set_ulimits(const struct sliver_resources *slr)
434 set_one_ulimit(RLIMIT_RSS, &slr->vs_rss);
435 set_one_ulimit(RLIMIT_AS, &slr->vs_as);
436 set_one_ulimit(RLIMIT_NPROC, &slr->vs_nproc);
437 set_one_ulimit(RLIMIT_NOFILE, &slr->vs_openfd);
438 return set_personality(slr->personality);