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top hotplug memory support

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Another patch from Jim for top to support hot-pluggable memory. Not
fully tested on real hot-pluggable memory because neither of us have
it
This commit is contained in:
Craig Small
2011-07-14 21:16:02 +10:00
parent 29b8775c39
commit a26c3bfa39
7 changed files with 131 additions and 87 deletions
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59
proc/sysinfo.c
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@@ -24,9 +24,7 @@
#include <netinet/in.h> /* htons */
#endif
#ifndef OOMEM_ENABLE
long smp_num_cpus; /* number of CPUs */
#endif
#define BAD_OPEN_MESSAGE \
"Error: /proc must be mounted\n" \
@@ -182,11 +180,7 @@ static void old_Hertz_hack(void){
setlocale(LC_NUMERIC, savelocale);
jiffies = user_j + nice_j + sys_j + other_j;
seconds = (up_1 + up_2) / 2;
#ifndef OOMEM_ENABLE
h = (unsigned)( (double)jiffies/seconds/smp_num_cpus );
#else
h = (unsigned)( (double)jiffies/seconds/smp_num_cpus() );
#endif
/* actual values used by 2.4 kernels: 32 64 100 128 1000 1024 1200 */
switch(h){
case 9 ... 11 : Hertz = 10; break; /* S/390 (sometimes) */
@@ -252,44 +246,13 @@ static int check_for_privs(void){
return !!rc;
}
#ifdef OOMEM_ENABLE
long smp_num_cpus(void)
{
static long _smp_num_cpus=-1; /* number of CPUs */
if (_smp_num_cpus != -1)
return(_smp_num_cpus);
// ought to count CPUs in /proc/stat instead of relying
// on glibc, which foolishly tries to parse /proc/cpuinfo
//
// SourceForge has an old Alpha running Linux 2.2.20 that
// appears to have a non-SMP kernel on a 2-way SMP box.
// _SC_NPROCESSORS_CONF returns 2, resulting in HZ=512
// _SC_NPROCESSORS_ONLN returns 1, which should work OK
_smp_num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if(_smp_num_cpus<1) _smp_num_cpus=1; /* SPARC glibc is buggy */
return(_smp_num_cpus);
}
#endif
static void init_libproc(void) __attribute__((constructor));
static void init_libproc(void){
have_privs = check_for_privs();
init_Linux_version(); /* Must be called before we check code */
#ifndef OOMEM_ENABLE
// ought to count CPUs in /proc/stat instead of relying
// on glibc, which foolishly tries to parse /proc/cpuinfo
//
// SourceForge has an old Alpha running Linux 2.2.20 that
// appears to have a non-SMP kernel on a 2-way SMP box.
// _SC_NPROCESSORS_CONF returns 2, resulting in HZ=512
// _SC_NPROCESSORS_ONLN returns 1, which should work OK
smp_num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if(smp_num_cpus<1) smp_num_cpus=1; /* SPARC glibc is buggy */
#endif
cpuinfo();
if(linux_version_code > LINUX_VERSION(2, 4, 0)){
Hertz = find_elf_note(AT_CLKTCK);
if(Hertz!=NOTE_NOT_FOUND) return;
@@ -978,3 +941,19 @@ unsigned get_pid_digits(void){
out:
return ret;
}
///////////////////////////////////////////////////////////////////////////
void cpuinfo (void) {
// ought to count CPUs in /proc/stat instead of relying
// on glibc, which foolishly tries to parse /proc/cpuinfo
//
// SourceForge has an old Alpha running Linux 2.2.20 that
// appears to have a non-SMP kernel on a 2-way SMP box.
// _SC_NPROCESSORS_CONF returns 2, resulting in HZ=512
// _SC_NPROCESSORS_ONLN returns 1, which should work OK
smp_num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (smp_num_cpus<1) /* SPARC glibc is buggy */
smp_num_cpus=1;
}