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.
37 #include <sys/resource.h>
40 #include "planetlab.h"
41 #include "sched_cmd.h"
46 create_context(xid_t ctx, uint32_t flags, uint64_t bcaps, const rspec_t *rspec)
48 struct vc_ctx_caps vc_caps;
49 struct vc_ctx_flags vc_flags;
50 struct vc_set_sched vc_sched;
51 struct vc_rlimit vc_rlimit;
53 /* create context info */
54 if (vc_ctx_create(ctx) == VC_NOCTX)
57 /* set capabilities - these don't take effect until SETUP flags is unset */
58 vc_caps.bcaps = bcaps;
59 vc_caps.bmask = ~0ULL; /* currently unused */
60 vc_caps.ccaps = 0; /* don't want any of these */
61 vc_caps.cmask = ~0ULL;
62 if (vc_set_ccaps(ctx, &vc_caps))
65 /* ignore all flags except SETUP and scheduler flags */
66 vc_flags.mask = VC_VXF_STATE_SETUP | VC_VXF_SCHED_FLAGS;
67 /* don't let user change scheduler flags */
68 vc_flags.flagword = flags & ~VC_VXF_SCHED_FLAGS; /* SETUP not set */
70 /* set scheduler parameters */
71 vc_flags.flagword |= rspec->cpu_sched_flags;
72 vc_sched.set_mask = (VC_VXSM_FILL_RATE | VC_VXSM_INTERVAL | VC_VXSM_TOKENS |
73 VC_VXSM_TOKENS_MIN | VC_VXSM_TOKENS_MAX);
74 vc_sched.fill_rate = rspec->cpu_share; /* tokens accumulated per interval */
75 vc_sched.interval = 1000; /* milliseconds */
76 vc_sched.tokens = 100; /* initial allocation of tokens */
77 vc_sched.tokens_min = 50; /* need this many tokens to run */
78 vc_sched.tokens_max = 100; /* max accumulated number of tokens */
79 if (vc_set_sched(ctx, &vc_sched))
82 /* set resource limits */
83 vc_rlimit.min = VC_LIM_KEEP;
84 vc_rlimit.soft = VC_LIM_KEEP;
85 vc_rlimit.hard = rspec->mem_limit;
86 if (vc_set_rlimit(ctx, RLIMIT_RSS, &vc_rlimit))
89 /* assume min and soft unchanged by set_rlimit */
90 vc_rlimit.hard = rspec->task_limit;
91 if (vc_set_rlimit(ctx, RLIMIT_NPROC, &vc_rlimit))
94 /* set flags, unset SETUP flag - this allows other processes to migrate */
95 if (vc_set_cflags(ctx, &vc_flags))
102 pl_chcontext(xid_t ctx, uint32_t flags, uint64_t bcaps, const rspec_t *rspec)
106 struct vc_ctx_flags vc_flags;
108 if (vc_get_cflags(ctx, &vc_flags))
110 /* context doesn't exist - create it */
111 if (create_context(ctx, flags, bcaps, rspec))
114 /* another process beat us in a race */
117 /* another process is creating - poll the SETUP flag */
122 /* created context and migrated to it i.e., we're done */
126 /* check the SETUP flag */
127 if (vc_flags.flagword & VC_VXF_STATE_SETUP)
129 /* context is still being setup - wait a while then retry */
134 /* context has been setup */
136 if (!vc_ctx_migrate(ctx))
139 /* context disappeared - retry */