From: Kornilios Kourtis <kkourt@cslab.ece.ntua.gr>
To: linux-numa@vger.kernel.org
Subject: find the node that a cpu belongs to
Date: Tue, 17 Mar 2009 03:09:10 +0200 [thread overview]
Message-ID: <20090317010910.GA9590@solar.cslab.ece.ntua.gr> (raw)
Hi,
I was wondering if you would be interested in adding a libnuma function
for determing the node that a cpu belongs to.
Something like this maybe ?
I could write a more complete patch if needed
(libnuma.h,version.ldscript,numa.3 ?)
--- libnuma.c.2 2009-03-16 23:32:52.000000000 +0000
+++ libnuma.c 2009-03-17 00:28:21.000000000 +0000
@@ -1784,3 +1784,34 @@ err:
numa_bitmask_free(mask);
return NULL;
}
+
+int numa_node_from_cpu_v2(int cpu)
+{
+ struct bitmask *bmp;
+ int ncpus, nnodes, node, ret;
+
+ ncpus = numa_num_possible_cpus();
+ if (cpu > ncpus){
+ errno = ERANGE;
+ return -1;
+ }
+
+ bmp = numa_bitmask_alloc(ncpus);
+ nnodes = numa_num_configured_nodes();
+ for (node = 0; node < nnodes; node++){
+ numa_node_to_cpus_v2(node, bmp);
+ if (numa_bitmask_isbitset(bmp, cpu)){
+ ret = node;
+ goto end;
+ }
+ }
+
+ /* I don't think this is supposed to happen */
+ ret = -1;
+ errno = EINVAL;
+end:
+ numa_bitmask_free(bmp);
+ return ret;
+}
+__asm__(".symver numa_node_from_cpu_v2,numa_node_from_cpu@@libnuma_1.2");
--
Kornilios Kourtis
next reply other threads:[~2009-03-17 1:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-17 1:09 Kornilios Kourtis [this message]
2009-03-17 10:45 ` find the node that a cpu belongs to Andi Kleen
2009-03-17 11:32 ` Kornilios Kourtis
2009-03-17 11:59 ` Andi Kleen
2009-03-18 15:19 ` Kornilios Kourtis
2009-03-19 14:16 ` Cliff Wickman
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