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Viktor Barzin 2025-11-22 22:39:36 +00:00
parent 090766cab0
commit a33f99e765
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dot_tmux/plugins/tmux-mem-cpu-load/linux/memory.cc Normal file
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/* vim: tabstop=2 shiftwidth=2 expandtab textwidth=80 linebreak wrap
*
* Copyright 2012 Matthew McCormick
* Copyright 2015 Pawel 'l0ner' Soltys
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sstream>
#include <fstream>
#include <sys/sysinfo.h>
#include "memory.h"
#include "conversions.h"
void mem_status( MemoryStatus & status )
{
std::string line;
std::string substr;
size_t substr_start;
size_t substr_len;
unsigned int total_mem;
unsigned int used_mem;
/* Since linux uses some RAM for disk caching, the actuall used ram is lower
* than what sysinfo(), top or free reports. htop reports the usage in a
* correct way. The memory used for caching doesn't count as used, since it
* can be freed in any moment. Usually it hapens automatically, when an
* application requests memory.
* In order to calculate the ram that's actually used we need to use the
* following formula:
* total_ram + shmem - free_ram - buffered_ram - cached_ram - srclaimable
*
* example data, junk removed, with comments added:
*
* MemTotal: 61768 kB old
* MemFree: 1436 kB old
* MemAvailable ????? kB ??
* MemShared: 0 kB old (now always zero; not calculated)
* Buffers: 1312 kB old
* Cached: 20932 kB old
* SwapTotal: 122580 kB old
* SwapFree: 60352 kB old
*/
std::ifstream memory_info("/proc/meminfo");
while( std::getline( memory_info, line ) )
{
substr_start = 0;
substr_len = line.find_first_of( ':' );
substr = line.substr( substr_start, substr_len );
substr_start = line.find_first_not_of( " ", substr_len + 1 );
substr_len = line.find_first_of( 'k' ) - substr_start;
if( substr.compare( "MemTotal" ) == 0 )
{
// get total memory
total_mem = stol( line.substr( substr_start, substr_len ) );
}
else if( substr.compare( "MemFree" ) == 0 )
{
used_mem = total_mem - stol( line.substr( substr_start, substr_len ) );
}
else if( substr.compare( "Shmem" ) == 0 )
{
used_mem += stol( line.substr( substr_start, substr_len ) );
}
else if( substr.compare( "Buffers" ) == 0 ||
substr.compare( "Cached" ) == 0 ||
substr.compare( "SReclaimable" ) == 0 )
{
used_mem -= stol( line.substr( substr_start, substr_len ) );
}
}
// we want megabytes on output, but since the values already come as
// kilobytes we need to divide them by 1024 only once, thus we use
// KILOBYTES
status.used_mem = convert_unit(static_cast< float >( used_mem ), MEGABYTES, KILOBYTES);
status.total_mem = convert_unit(static_cast< float >( total_mem ), MEGABYTES, KILOBYTES);
}