Messages in this thread | | | Date | Thu, 12 Apr 2001 22:03:59 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: [PATCH] Re: memory usage - dentry_cacheg |
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On Thu, 12 Apr 2001, Ed Tomlinson wrote:
> On Thursday 12 April 2001 11:12, Alexander Viro wrote: > What prompted my patch was observing situations where the icache (and dcache > too) got so big that they were applying artifical pressure to the page and > buffer caches. I say artifical since checking the stats these caches showed > over 95% of the entries unused. At this point there is usually another 10% > or so of objects allocated by the slab caches but not accounted for in the > stats (not a problem they are accounted if the cache starts using them).
"Unused" as in "->d_count==0"? That _is_ OK. Basically, you will have positive ->d_count only on directories and currently opened files. E.g. during compile in /usr/include/* you will have 3-5 file dentries with ->d_count > 0 - ones that are opened _now_. It doesn't mean that everything else rest is unused in any meaningful sense. Can be freed - yes, but that's a different story.
If you are talking about "unused" from the slab POV - _ouch_. Looks like extremely bad fragmentation ;-/ It's surprising, and if that's thte case I'd like to see more details. Al
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