On 11/03/14 09:23, Julian Elischer wrote:
On 11/3/14, 4:21 PM, Julian Elischer wrote:
On 11/3/14, 3:46 PM, Mateusz Guzik wrote:
Author: mjg
Date: Mon Nov 3 07:46:51 2014
New Revision: 274017
URL: https://svnweb.freebsd.org/changeset/base/274017
Log:
Provide an on-stack temporary buffer for small ioctl requests.
I'm not sure I like this. We don't know how many more levels
of stack may be needed.
I know that machines are getting faster with more memory,
but the current move towards bloating out the
... "bloating out the stack" ...
worries me. we started out with a single page of stack (SHARED
with the U-area!). I think we are now at several pages.. I forget, is
it 8?
I'm open to being persuaded but I think we need to have a discussion
about stack usage. We used to say that anything greater that, say
64 bytes should probably be allocated.
Hi,
I think this patch can give a benefit for the USB stack and CUSE4BSD,
because it does frequent IOCTLs. Regarding the stack usage, maybe this
general purpose optimisation can be allocated from the thread structure?
--HPS
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