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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2005-07-27 11:44:57 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-27 16:26:04 -0700
commit951f22d5b1f0eaae35dafc669e3774a0c2084d10 (patch)
tree66c0131b576dadb98026da11d624df453c4c9a7c /include/asm-s390/lowcore.h
parent8449d003f323ca7a00eec38905d984ba5ec83a29 (diff)
downloadlinux-stericsson-951f22d5b1f0eaae35dafc669e3774a0c2084d10.tar.gz
[PATCH] s390: spin lock retry
Split spin lock and r/w lock implementation into a single try which is done inline and an out of line function that repeatedly tries to get the lock before doing the cpu_relax(). Add a system control to set the number of retries before a cpu is yielded. The reason for the spin lock retry is that the diagnose 0x44 that is used to give up the virtual cpu is quite expensive. For spin locks that are held only for a short period of time the costs of the diagnoses outweights the savings for spin locks that are held for a longer timer. The default retry count is 1000. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-s390/lowcore.h')
-rw-r--r--include/asm-s390/lowcore.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/asm-s390/lowcore.h b/include/asm-s390/lowcore.h
index 76b5b19c0ae2..afe6a9f9b0ae 100644
--- a/include/asm-s390/lowcore.h
+++ b/include/asm-s390/lowcore.h
@@ -90,7 +90,6 @@
#define __LC_SYSTEM_TIMER 0x278
#define __LC_LAST_UPDATE_CLOCK 0x280
#define __LC_STEAL_CLOCK 0x288
-#define __LC_DIAG44_OPCODE 0x290
#define __LC_KERNEL_STACK 0xD40
#define __LC_THREAD_INFO 0xD48
#define __LC_ASYNC_STACK 0xD50
@@ -286,8 +285,7 @@ struct _lowcore
__u64 system_timer; /* 0x278 */
__u64 last_update_clock; /* 0x280 */
__u64 steal_clock; /* 0x288 */
- __u32 diag44_opcode; /* 0x290 */
- __u8 pad8[0xc00-0x294]; /* 0x294 */
+ __u8 pad8[0xc00-0x290]; /* 0x290 */
/* System info area */
__u64 save_area[16]; /* 0xc00 */
__u8 pad9[0xd40-0xc80]; /* 0xc80 */