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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-- 936 bytes
Makefile -rw-r--r-- 174 bytes
autofs_i.h -rw-r--r-- 7.8 KB
dev-ioctl.c -rw-r--r-- 18.0 KB
expire.c -rw-r--r-- 13.6 KB
init.c -rw-r--r-- 1.2 KB
inode.c -rw-r--r-- 8.6 KB
root.c -rw-r--r-- 23.3 KB
symlink.c -rw-r--r-- 951 bytes
waitq.c -rw-r--r-- 14.1 KB
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