xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[PATCH] Directed yield: direct yield of spinlocks for s390.

Browse Source 
Use the new diagnose 0x9c in the spinlock implementation for s390.  It
yields the remaining timeslice of the virtual cpu that tries to acquire a
lock to the virtual cpu that is the current holder of the lock.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Martin Schwidefsky
2006-09-30 23:27:45 -07:00
committed by Linus Torvalds
parent cdc39363d3
commit 3c1fcfe229
6 changed files with 87 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
arch/s390/kernel/head64.S
View File

@@ -250,6 +250,17 @@ startup_continue:
oi 7(%r12),0x80 # set IDTE flag
0:
#
# find out if the diag 0x9c is available
#
la %r1,0f-.LPG1(%r13) # set program check address
stg %r1,__LC_PGM_NEW_PSW+8
stap __LC_CPUID+4 # store cpu address
lh %r1,__LC_CPUID+4
diag %r1,0,0x9c # test diag 0x9c
oi 6(%r12),1 # set diag9c flag
0:
#
# find out if we have the MVCOS instruction
#