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05 April 2024, 19:05:47 UTC
Revision a516440542afcb9647f88d12c35640baf02d07ea authored by Jens Axboe on 10 September 2014, 15:02:03 UTC, committed by Jens Axboe on 10 September 2014, 15:02:03 UTC 
blk-mq: scale depth and rq map appropriate if low on memory
 
If we are running in a kdump environment, resources are scarce.
For some SCSI setups with a huge set of shared tags, we run out
of memory allocating what the drivers is asking for. So implement
a scale back logic to reduce the tag depth for those cases, allowing
the driver to successfully load.

We should extend this to detect low memory situations, and implement
a sane fallback for those (1 queue, 64 tags, or something like that).

Tested-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
1 parent df35c7c
History
Tip revision: a516440542afcb9647f88d12c35640baf02d07ea authored by Jens Axboe on 10 September 2014, 15:02:03 UTC
blk-mq: scale depth and rq map appropriate if low on memory
Tip revision: a516440
File Mode Size
Kconfig -rw-r--r-- 1.4 KB
Makefile -rw-r--r-- 265 bytes
bind.c -rw-r--r-- 6.9 KB
daemon.c -rw-r--r-- 16.4 KB
interface.c -rw-r--r-- 14.6 KB
internal.h -rw-r--r-- 10.8 KB
key.c -rw-r--r-- 3.7 KB
main.c -rw-r--r-- 2.4 KB
namei.c -rw-r--r-- 24.3 KB
proc.c -rw-r--r-- 3.1 KB
rdwr.c -rw-r--r-- 24.6 KB
security.c -rw-r--r-- 2.7 KB
xattr.c -rw-r--r-- 7.1 KB
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