Date: Tue, 31 Jan 1995 18:58:48 -0500 From: Garrett Wollman <wollman@halloran-eldar.lcs.mit.edu> To: terry@cs.weber.edu (Terry Lambert) Cc: roberto@blaise.ibp.fr (Ollivier ROBERT), jkh@freefall.cdrom.com, hackers@freefall.cdrom.com Subject: Re: Optimizing CVS? Message-ID: <9501312358.AA18319@halloran-eldar.lcs.mit.edu> In-Reply-To: <9501312131.AA28664@cs.weber.edu> References: <9501310915.AA04063@blaise.ibp.fr> <9501312131.AA28664@cs.weber.edu>
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<<On Tue, 31 Jan 95 14:31:28 MST, terry@cs.weber.edu (Terry Lambert) said:
> Finally, the inode cache needs to be moved over to a vnode cache instead,
> and generalized at the comsumer level for the file system (ie: moved the
> hell out of UFS). SVR4 actually has this one right with their DNLC
> mechanism, although they (incorrectly) do not allow for use of the DNLC
> as a negative hit cache.
Gee, this sure looks like a vnode cache to me...
/*
* Look for a the name in the cache. We don't do this
* if the segment name is long, simply so the cache can avoid
* holding long names (which would either waste space, or
* add greatly to the complexity).
*
* Lookup is called with ni_dvp pointing to the directory to search,
* ni_ptr pointing to the name of the entry being sought, ni_namelen
* tells the length of the name, and ni_hash contains a hash of
* the name. If the lookup succeeds, the vnode is returned in ni_vp
* and a status of -1 is returned. If the lookup determines that
* the name does not exist (negative cacheing), a status of ENOENT
* is returned. If the lookup fails, a status of zero is returned.
*/
int
cache_lookup(dvp, vpp, cnp)
struct vnode *dvp;
struct vnode **vpp;
struct componentname *cnp;
-GAWollman
--
Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ...
wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence. We like people
MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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