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107 lines
2.8 KiB
107 lines
2.8 KiB
/*
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* Copyright 2011 Samy Al Bahra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ck_cc.h>
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#include <ck_pr.h>
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#ifdef __linux__
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#include <sched.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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#endif
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#ifndef CORES
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#define CORES 8
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#endif
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struct affinity {
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unsigned int delta;
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unsigned int request;
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};
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#define AFFINITY_INITIALIZER {0, 0}
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#ifdef __linux__
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#ifndef gettid
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static pid_t
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gettid(void)
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{
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return syscall(__NR_gettid);
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}
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#endif /* gettid */
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CK_CC_UNUSED static int
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aff_iterate(struct affinity *acb)
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{
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cpu_set_t s;
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unsigned int c;
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c = ck_pr_faa_uint(&acb->request, acb->delta);
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CPU_ZERO(&s);
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CPU_SET(c % CORES, &s);
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return sched_setaffinity(gettid(), sizeof(s), &s);
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}
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#else
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CK_CC_UNUSED static int
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aff_iterate(struct affinity *acb CK_CC_UNUSED)
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{
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return (0);
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}
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#endif
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CK_CC_INLINE static uint64_t
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rdtsc(void)
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{
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#if defined(__x86_64__)
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uint32_t eax = 0, edx;
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__asm__ __volatile__("cpuid;"
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"rdtsc;"
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: "+a" (eax), "=d" (edx)
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:
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: "%ecx", "%ebx", "memory");
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__asm__ __volatile__("xorl %%eax, %%eax;"
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"cpuid;"
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:
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:
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: "%eax", "%ebx", "%ecx", "%edx", "memory");
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return (((uint64_t)edx << 32) | eax);
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#elif defined(__sparcv9__)
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uint64_t r;
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__asm__ __volatile__("rd %%tick, %0" : "=r" (r) :: "memory");
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return r;
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#else
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return 0;
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#endif
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}
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