xen-scsiback: Convert to percpu_ida tag allocation

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This patch converts xen-scsiback to use percpu_ida tag
pre-allocation for struct vscsibk_pend descriptor, in
order to avoid fast-path struct vscsibk_pend memory
allocations.

Note by default this is currently hardcoded to 128.

(Add wrapper for handling pending_req tag failure - Juergen)
(Drop left-over se_cmd memset in scsiback_cmd_exec - Juergen)

Acked-by: Juergen Gross <jgross@suse.com>
Tested-by: Juergen Gross <jgross@suse.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

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This commit is contained in:

Nicholas Bellinger 2016-01-24 22:41:50 -08:00

parent cff834c16d

commit 2dbcdf33db

1 changed files with 89 additions and 78 deletions

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drivers/xen/xen-scsiback.c

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