linux

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Peter Oberparleiter 449666dd1e s390/cio: More efficient handling of CHPID availability events

The CIO layer processes hardware events that indicate that a channel
path has become available by performing a scan of available subchannels
using the Store Subchannel (STSCH) instruction. Performing too many
STSCH instructions in a tight loop can cause high Hypervisor overhead
which can negatively impact the performance of the virtual machine as
a whole.

This patch reduces the number of STSCH instructions performed while
processing a resource accessibility event and while varying a CHPID
online.

In both cases, Linux first performs a STSCH instruction on each unused
subchannel to see if the subchannel has become available. If the STSCH
instruction indicates that the subchannel is available, a full
evaluation of this subchannel is scheduled. Since the full evaluation
includes performing a STSCH instruction, the initial STSCH is
unnecessary and can be removed.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2013-12-16 14:37:40 +01:00

block

s390/dasd: fix memory leak caused by dangling references to request_queue

2013-12-02 15:31:06 +01:00

char

s390/sclp: replace uninitialized early_event_mask_sccb variable with sccb_early

2013-12-02 15:31:07 +01:00

cio

s390/cio: More efficient handling of CHPID availability events

2013-12-16 14:37:40 +01:00

crypto

s390/s390dbf: use debug_level_enabled() where applicable