htop/Affinity.c

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/*
htop - Affinity.c
(C) 2004-2011 Hisham H. Muhammad
(C) 2020 Red Hat, Inc. All Rights Reserved.
Released under the GNU GPLv2, see the COPYING file
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in the source distribution for its full text.
*/
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#include "config.h"
#include "Affinity.h"
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#include <stdlib.h>
#include "XUtils.h"
#ifdef HAVE_LIBHWLOC
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#include <hwloc.h>
#include <hwloc/bitmap.h>
#ifdef __linux__
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#define HTOP_HWLOC_CPUBIND_FLAG HWLOC_CPUBIND_THREAD
#else
#define HTOP_HWLOC_CPUBIND_FLAG HWLOC_CPUBIND_PROCESS
#endif
#elif defined(HAVE_LINUX_AFFINITY)
#include <sched.h>
#endif
Affinity* Affinity_new(ProcessList* pl) {
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Affinity* this = xCalloc(1, sizeof(Affinity));
this->size = 8;
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this->cpus = xCalloc(this->size, sizeof(int));
this->pl = pl;
return this;
}
void Affinity_delete(Affinity* this) {
free(this->cpus);
free(this);
}
void Affinity_add(Affinity* this, int id) {
if (this->used == this->size) {
this->size *= 2;
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this->cpus = xRealloc(this->cpus, sizeof(int) * this->size);
}
this->cpus[this->used] = id;
this->used++;
}
#ifdef HAVE_LIBHWLOC
Affinity* Affinity_get(Process* proc, ProcessList* pl) {
hwloc_cpuset_t cpuset = hwloc_bitmap_alloc();
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bool ok = (hwloc_get_proc_cpubind(pl->topology, proc->pid, cpuset, HTOP_HWLOC_CPUBIND_FLAG) == 0);
Affinity* affinity = NULL;
if (ok) {
affinity = Affinity_new(pl);
if (hwloc_bitmap_last(cpuset) == -1) {
for (int i = 0; i < pl->cpuCount; i++) {
Affinity_add(affinity, i);
}
} else {
unsigned int id;
hwloc_bitmap_foreach_begin(id, cpuset);
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Affinity_add(affinity, id);
hwloc_bitmap_foreach_end();
}
}
hwloc_bitmap_free(cpuset);
return affinity;
}
bool Affinity_set(Process* proc, Arg arg) {
Affinity *this = arg.v;
hwloc_cpuset_t cpuset = hwloc_bitmap_alloc();
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for (int i = 0; i < this->used; i++) {
hwloc_bitmap_set(cpuset, this->cpus[i]);
}
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bool ok = (hwloc_set_proc_cpubind(this->pl->topology, proc->pid, cpuset, HTOP_HWLOC_CPUBIND_FLAG) == 0);
hwloc_bitmap_free(cpuset);
return ok;
}
#elif defined(HAVE_LINUX_AFFINITY)
Affinity* Affinity_get(Process* proc, ProcessList* pl) {
cpu_set_t cpuset;
bool ok = (sched_getaffinity(proc->pid, sizeof(cpu_set_t), &cpuset) == 0);
if (!ok) return NULL;
Affinity* affinity = Affinity_new(pl);
for (int i = 0; i < pl->cpuCount; i++) {
if (CPU_ISSET(i, &cpuset))
Affinity_add(affinity, i);
}
return affinity;
}
bool Affinity_set(Process* proc, Arg arg) {
Affinity *this = arg.v;
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
for (int i = 0; i < this->used; i++) {
CPU_SET(this->cpus[i], &cpuset);
}
bool ok = (sched_setaffinity(proc->pid, sizeof(unsigned long), &cpuset) == 0);
return ok;
}
#endif