Skip to main content

Browse the archive

https://github.com/torvalds/linux
27 March 2024, 02:37:15 UTC
Revision ceb1cbac8eda66cf0f889def226b4e82f8ff857b authored by Kamalesh Babulal on 31 May 2012, 07:37:38 UTC, committed by Ingo Molnar on 06 June 2012, 14:37:59 UTC 
sched/x86: Calculate booted cores after construction of sibling_mask
 
Commit 316ad248307fb ("sched/x86: Rewrite set_cpu_sibling_map()")
broke the booted_cores accounting.

The problem is that the booted_cores accounting needs all the
sibling links set up. So restore the second loop and add a comment as
to why its needed.

On qemu booted with -smp sockets=1,cores=2,threads=2;
Before:
 $ grep cores /proc/cpuinfo
 cpu cores       : 2
 cpu cores       : 1
 cpu cores       : 4
 cpu cores       : 3

With the patch:
 $ grep cores /proc/cpuinfo
 cpu cores       : 2
 cpu cores       : 2
 cpu cores       : 2
 cpu cores       : 2

Reported-by: Prarit Bhargava <prarit@redhat.com>
Reported-by: Borislav Petkov <bp@amd64.org>
Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120531073738.GH7511@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent eea5b55
History
Tip revision: ceb1cbac8eda66cf0f889def226b4e82f8ff857b authored by Kamalesh Babulal on 31 May 2012, 07:37:38 UTC
sched/x86: Calculate booted cores after construction of sibling_mask
Tip revision: ceb1cba
File Mode Size
Documentation
arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 1014 bytes
.mailmap -rw-r--r-- 4.3 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 92.7 KB
Kbuild -rw-r--r-- 2.5 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 207.6 KB
Makefile -rw-r--r-- 46.0 KB
README -rw-r--r-- 17.3 KB
REPORTING-BUGS -rw-r--r-- 3.3 KB

README

back to top