From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Fri, 29 Jul 2016 12:13:34 +0000 (+0200)
Subject: lscpu: only try to read sysfs attributes of present CPUs
X-Git-Tag: v2.29-rc1~137
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0002704ebe998d70af87d4385cc243baae7b2059;p=thirdparty%2Futil-linux.git

lscpu: only try to read sysfs attributes of present CPUs

lscpu can skip all CPUs which are possible but not present. For
configurations where a lot of CPUs are possible but only few CPUs are
present this saves a lot of pointless glibc/system calls.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---

diff --git a/sys-utils/lscpu.c b/sys-utils/lscpu.c
index dbb639c2fe..1da595b3da 100644
--- a/sys-utils/lscpu.c
+++ b/sys-utils/lscpu.c
@@ -2059,6 +2059,10 @@ int main(int argc, char *argv[])
 	read_basicinfo(desc, mod);
 
 	for (i = 0; i < desc->ncpuspos; i++) {
+		/* only consider present CPUs */
+		if (desc->present &&
+		    !CPU_ISSET(real_cpu_num(desc, i), desc->present))
+			continue;
 		read_topology(desc, i);
 		read_cache(desc, i);
 		read_polarization(desc, i);