71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
/* vim: tabstop=2 shiftwidth=2 expandtab textwidth=80 linebreak wrap
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*
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* Copyright 2012 Matthew McCormick
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* Copyright 2015 Pawel 'l0ner' Soltys
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Based on: github.com/freebsd/freebsd/blob/master/usr.bin/top/machine.c
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// Based on: Apple.cpp for load_string/mem_string and apple's documentation
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#include <sstream>
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#include <string>
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#include <sys/types.h>
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#include <unistd.h>
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#include "getsysctl.h"
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#include "memory.h"
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#include "conversions.h"
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void mem_status( MemoryStatus & status )
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{
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// These values are in bytes
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//u_int total;
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//u_int free;
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//u_int inactive;
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//u_int cache;
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u_int wired;
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u_int active;
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u_int page_size;
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u_int page_count;
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// Get total physical memory, page size, and some other needed info
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// instead of using realmem which reports quantity of ram installed on
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// platform, use physmem which reports ram available to system.
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//GETSYSCTL( "hw.physmem", total );
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page_size = getpagesize();
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// page count reflects actual size of memory we have available for
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// applications. it will be less than realmem or physmem, since it doesn't
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// include what's been allocated for kernel, but it will be equal to
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// free + inactive + cache + wired + active, and thus will reflect better
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// what's actually available.
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GETSYSCTL( "vm.stats.vm.v_page_count", page_count );
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//GETSYSCTL( "vm.stats.vm.v_free_count", free );
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//GETSYSCTL( "vm.stats.vm.v_inactive_count", inactive );
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//GETSYSCTL( "vm.stats.vm.v_cache_count", cache );
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GETSYSCTL( "vm.stats.vm.v_wire_count", wired ); // Buffers
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GETSYSCTL( "vm.stats.vm.v_active_count", active );
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// Get all memory which can be allocated, which on FreeBSD is:
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// cached + inactive + free
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//u_int unused = ( cache + inactive + free ) * page_size;
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// Used memory on FreeBSD is active + wired.
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u_int used = ( active + wired ) * page_size;
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status.used_mem = convert_unit( static_cast< float >( used ), MEGABYTES );
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status.total_mem = convert_unit( static_cast< float >( page_count * (page_size >> 10) ), MEGABYTES, KILOBYTES);
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}
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