[OpenAFS-devel] suggested feature...

[Neulinger, Nathan]

Looks like this:

#define afs_CacheIsTooFull() \
    (afs_blocksUsed - afs_blocksDiscarded > \
        (CM_DCACHECOUNTFREEPCT*afs_cacheBlocks)/100 || \
     afs_freeDCCount - afs_discardDCCount < \
        ((100-CM_DCACHECOUNTFREEPCT)*afs_cacheFiles)/100)

#define afs_MaybeWakeupTruncateDaemon() \
    do { \
        if (!afs_CacheTooFull && afs_CacheIsTooFull()) { \
            afs_CacheTooFull = 1; \
            if (!afs_TruncateDaemonRunning) { \
                afs_osi_Wakeup((char *)afs_CacheTruncateDaemon); \
            } \
        } else if (!afs_TruncateDaemonRunning && \
                   afs_blocksDiscarded > CM_MAXDISCARDEDCHUNKS) { \
            afs_osi_Wakeup((char *)afs_CacheTruncateDaemon); \
        } \
    } while (0)

in afs/afs.h is the primary logic of what triggers the truncate daemon.
(There are several places where those macros are used in afs_dcache.c for
example. 

Seems like adjustting afs_CacheIsTooFull() to call a cache-type specific
routine that can check additional
usage limits would be enough to get this to work.

Now just need to figure out a little more of this code to see how to add in
such a routine, which will most likely be kernel specific, so would likely
be one of those cases where the routine is a no-op virtually everywhere
except where it is implemented. (If someone else is much more familiar with
the internals has any ideas here, please speak up.)

-- Nathan

> -----Original Message-----
> From: Derek Atkins [mailto:warlord@MIT.EDU]
> Sent: Tuesday, September 25, 2001 10:40 AM
> To: Neulinger, Nathan
> Cc: 'openafs-devel@openafs.org'
> Subject: Re: [OpenAFS-devel] suggested feature...
> 
> 
> Submit a patch. :)
> 
> -derek
> 
> "Neulinger, Nathan" <nneul@umr.edu> writes:
> 
> > > YMMV.
> > 
> > Exactly. All the more reason to have it at least handle a 
> situation where
> > it's not quite right.
> > 
> > -- Nathan
> > _______________________________________________
> > OpenAFS-devel mailing list
> > OpenAFS-devel@openafs.org
> > https://lists.openafs.org/mailman/listinfo/openafs-devel
> 
> -- 
>        Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
>        Member, MIT Student Information Processing Board  (SIPB)
>        URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
>        warlord@MIT.EDU                        PGP key available
>