PWN-Hunter/android_kernel_xiaomi_sdm845
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86: fix incorrect __read_mostly on _boot_cpu_pda

Browse Source 
The pda rework (commit 3461b0af02)
to remove static boot cpu pdas introduced a performance bug.

_boot_cpu_pda is the actual pda used by the boot cpu and is definitely
not "__read_mostly" and ended up polluting the read mostly section with
writes.  This bug caused regression of about 8-10% on certain syscall
intensive workloads.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Acked-by: Mike Travis <travis@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ravikiran G Thirumalai 2008-12-31 13:44:46 -08:00 committed by Ingo Molnar
parent b58602a4ba
commit 26799a6311
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/head64.c
View File

@ -27,7 +27,7 @@
#include <asm/trampoline.h>
/* boot cpu pda */
static struct x8664_pda _boot_cpu_pda __read_mostly;
static struct x8664_pda _boot_cpu_pda;
#ifdef CONFIG_SMP
/*