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| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2008-01-26 14:10:48 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-01-26 14:11:03 +0100 |
| commit | e82a1567e4b22eb035da2499d20ddd573c9acf75 (patch) | |
| tree | 0cf697f96e734a846ee1cbc598beebcc7be10117 /drivers/s390/cio/css.h | |
| parent | [S390] cio: Set driver->owner on css, ccw and ccwgroup busses. (diff) | |
| download | linux-e82a1567e4b22eb035da2499d20ddd573c9acf75.tar.xz linux-e82a1567e4b22eb035da2499d20ddd573c9acf75.zip | |
[S390] cio: reduce cpu utilization during device scan
Minimize calls to cpu intensive function get_subchannel_by_schid()
by introducing function for_each_subchannel_staged() which
temporarily caches the information about registered subchannels
in a bitmap.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/css.h')
| -rw-r--r-- | drivers/s390/cio/css.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h index 40598b8ee27d..b70554523552 100644 --- a/drivers/s390/cio/css.h +++ b/drivers/s390/cio/css.h @@ -91,6 +91,9 @@ extern void css_driver_unregister(struct css_driver *); extern void css_sch_device_unregister(struct subchannel *); extern struct subchannel * get_subchannel_by_schid(struct subchannel_id); extern int css_init_done; +int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), + int (*fn_unknown)(struct subchannel_id, + void *), void *data); extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); extern void css_process_crw(int, int); extern void css_reiterate_subchannels(void); |