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Simplify memory calculations on OpenBSD by using uvmexp.pageshift

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This commit is contained in:
Jasper Lievisse Adriaanse 2016-05-03 20:33:43 +02:00
parent 68fd497108
commit 3f647a9b2b
1 changed files with 5 additions and 23 deletions
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28
openbsd/memory.cc
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@ -39,13 +39,6 @@
#include "memory.h"
#include "conversions.h"
static int pageshift;
#ifndef LOG1024
#define LOG1024 10
#endif
#define pagesh(size) ((size) << pageshift)
void mem_status( MemoryStatus & status )
{
// These values are in bytes
@ -63,16 +56,6 @@ void mem_status( MemoryStatus & status )
error( "memory: error getting page size" );
}
// calculate how far we must shift the variables
pageshift = 0;
while( page_size > 1 )
{
pageshift++;
page_size >>= 1;
}
pageshift -= LOG1024;
// get vm memory stats
static int uvmexp_mib[] = { CTL_VM, VM_UVMEXP };
struct uvmexp uvmexp;
@ -92,16 +75,15 @@ void mem_status( MemoryStatus & status )
}
// calculations based on libgtop
used_mem = (uint64_t) pagesh (uvmexp.npages - uvmexp.free) << LOG1024;
free_mem = (uint64_t) pagesh( uvmexp.free ) << LOG1024;
used_mem = ( (uint64_t) uvmexp.npages - uvmexp.free ) << uvmexp.pageshift;
free_mem = ( (uint64_t) uvmexp.free ) << uvmexp.pageshift;
// from nagios-memory plugin
used_mem -= pagesh( bcstats.numbufpages );
free_mem += pagesh( bcstats.numbufpages );
used_mem -= ( (uint64_t) bcstats.numbufpages ) << uvmexp.pageshift;
free_mem += ( (uint64_t) bcstats.numbufpages ) << uvmexp.pageshift;
// calculate total memory
total_mem = (uint64_t) pagesh( uvmexp.npages ) << LOG1024;
total_mem = ( (uint64_t) uvmexp.npages ) << uvmexp.pageshift;
status.used_mem = convert_unit(static_cast< float >( used_mem ), MEGABYTES );
status.total_mem = convert_unit(static_cast< float >( total_mem ), MEGABYTES );