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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-10-01 08:27:45 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-01 09:39:22 +0200 |
| commit | 3c1fcfe229e99752c74efb945a4a3f560be04204 (patch) | |
| tree | 44085d9b599e06a92426141811a6f712beac17aa /arch/s390/kernel/head64.S | |
| parent | [PATCH] Directed yield: direct yield of spinlocks for powerpc (diff) | |
| download | linux-3c1fcfe229e99752c74efb945a4a3f560be04204.tar.xz linux-3c1fcfe229e99752c74efb945a4a3f560be04204.zip | |
[PATCH] Directed yield: direct yield of spinlocks for s390.
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>
Diffstat (limited to 'arch/s390/kernel/head64.S')
| -rw-r--r-- | arch/s390/kernel/head64.S | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index 48998d50b00a..b30e5897cdf7 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -251,6 +251,17 @@ startup_continue: 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 # la %r1,0f-.LPG1(%r13) # set program check address |