| 1 | /* Copyright (c) 2007-2009, Stanford University |
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| 2 | * All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions are met: |
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| 6 | * * Redistributions of source code must retain the above copyright |
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| 7 | * notice, this list of conditions and the following disclaimer. |
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| 8 | * * Redistributions in binary form must reproduce the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer in the |
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| 10 | * documentation and/or other materials provided with the distribution. |
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| 11 | * * Neither the name of Stanford University nor the names of its |
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| 12 | * contributors may be used to endorse or promote products derived from |
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| 13 | * this software without specific prior written permission. |
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| 14 | * |
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| 15 | * THIS SOFTWARE IS PROVIDED BY STANFORD UNIVERSITY ``AS IS'' AND ANY |
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| 16 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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| 17 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 18 | * DISCLAIMED. IN NO EVENT SHALL STANFORD UNIVERSITY BE LIABLE FOR ANY |
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| 19 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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| 20 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 21 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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| 22 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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| 24 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 25 | */ |
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| 26 | |
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| 27 | #include <assert.h> |
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| 28 | #include <unistd.h> |
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| 29 | #include <sys/mman.h> |
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| 30 | #include "locality.h" |
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| 31 | #include "stddefines.h" |
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| 32 | #include "processor.h" |
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| 33 | |
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| 34 | static int num_cluster = 0; |
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| 35 | |
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| 36 | /* Retrieve the number of processors that belong to the locality |
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| 37 | group of the calling LWP. */ |
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| 38 | int loc_get_lgrp_size () |
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| 39 | { |
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| 40 | /* XXX smarter implementation? have all cpus local to this thread */ |
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| 41 | return proc_get_num_cpus () / loc_get_num_lgrps(); |
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| 42 | } |
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| 43 | |
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| 44 | /* Retrieve the number of total locality groups on system. */ |
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| 45 | int loc_get_num_lgrps () |
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| 46 | { |
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| 47 | if(num_cluster == 0) |
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| 48 | { |
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| 49 | num_cluster = sysconf(_SC_NCLUSTERS_ONLN); |
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| 50 | |
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| 51 | if(num_cluster < 1) |
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| 52 | num_cluster = 1; |
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| 53 | } |
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| 54 | |
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| 55 | return num_cluster; |
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| 56 | } |
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| 57 | |
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| 58 | /* Retrieve the locality group of the calling LWP. */ |
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| 59 | int loc_get_lgrp () |
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| 60 | { |
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| 61 | int cpuid = proc_get_cpuid(); |
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| 62 | |
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| 63 | assert(cpuid != -1); |
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| 64 | |
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| 65 | if (cpuid == -1) |
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| 66 | return 0; |
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| 67 | else |
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| 68 | return cpuid % loc_get_num_lgrps(); |
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| 69 | } |
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| 70 | |
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| 71 | /* Retrieve the locality group of the physical memory that backs |
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| 72 | the virtual address ADDR. */ |
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| 73 | int loc_mem_to_lgrp (void *addr) |
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| 74 | { |
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| 75 | minfo_t info; |
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| 76 | int err; |
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| 77 | |
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| 78 | err = mcntl(MCNTL_READ, addr, 1, &info); |
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| 79 | |
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| 80 | assert(err == 0); |
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| 81 | |
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| 82 | if(err != 0) return 0; |
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| 83 | |
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| 84 | return info.mi_cid; |
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| 85 | } |
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