Date: Fri, 6 Nov 1998 15:43:27 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Tor.Egge@fast.no Cc: cvs-committers@FreeBSD.ORG Subject: Re: sendfile.2 (was Re: cvs commit: ...) Message-ID: <199811062343.PAA02131@apollo.backplane.com> References: <199811061936.LAA00920@apollo.backplane.com> <199811061957.UAA04029@midten.fast.no>
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:> * critical state is stored on the supervisor stack. Not much of a
:> disadvantage here either.
:
:What about UPAGES pageouts (e.g. pmap_swapout_proc()) ? We should not
:store that kind of critical state in something that can be paged out.
:
:- Tor Egge
Yah, I wasn't sure about how that worked. We could simply
disable paging out of UPAGES in swapout while locks are present.
It wouldn't cause any problems.
If we keep track of the lock chain for the process, based at
curproc->p_somenewfield, it would be easy to use the fact
that the field is non-NULL to prevent a complete swapout from
occuring.
-Matt
Matthew Dillon Engineering, HiWay Technologies, Inc. & BEST Internet
Communications & God knows what else.
<dillon@backplane.com> (Please include original email in any response)
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