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ima: introduce multi-page collect buffers

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Use of multiple-page collect buffers reduces:
1) the number of block IO requests
2) the number of asynchronous hash update requests

Second is important for HW accelerated hashing, because significant
amount of time is spent for preparation of hash update operation,
which includes configuring acceleration HW, DMA engine, etc...
Thus, HW accelerators are more efficient when working on large
chunks of data.

This patch introduces usage of multi-page collect buffers. Buffer size
can be specified using 'ahash_bufsize' module parameter. Default buffer
size is 4096 bytes.

Changes in v3:
- kernel parameter replaced with module parameter

Signed-off-by: Dmitry Kasatkin <[email protected]>
Signed-off-by: Mimi Zohar <[email protected]>
This commit is contained in:
Dmitry Kasatkin 2014-05-06 14:47:13 +03:00 • committed by Mimi Zohar
commit 6edf7a8926
2 changed files with 104 additions and 2 deletions
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8
Documentation/kernel-parameters.txt
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@ -1322,6 +1322,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
different crypto accelerators. This option can be used
to achieve the best performance for a particular HW.
ima.ahash_bufsize= [IMA] Asynchronous hash buffer size
Format: <bufsize>
Set hashing buffer size. Default: 4k.
ahash performance varies for different chunk sizes on
different crypto accelerators. This option can be used
to achieve best performance for particular HW.
init= [KNL]
Format: <full_path>
Run specified binary instead of /sbin/init as init