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TAKE - add a statistics interface to pagebuf

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Subject: TAKE - add a statistics interface to pagebuf
From: Steve Lord <lord@xxxxxxx>
Date: Wed, 9 Aug 2000 15:32:44 -0500
Sender: owner-linux-xfs@xxxxxxxxxxx
This creates /proc/fs/pagebuf/stat - name and contents subject to change.
It reports 7 different numbers out of pagebuf in this format:

cat /proc/fs/pagebuf/stat
pagebuf 1573261 294824 1290019 630309 294812 4462 418748

The values are:

 o number of pagebuf_get calls
 o number of pagebufs created
 o number of requests for a locked pagebuf which succeeded
 o number of non-blocking requests for a locked which failed
 o number of requests for a locked pagebuf which failed due to no pagebuf
 o number of calls to allocate a page for insertion in a pagebuf
 o number of hits in the page_cache when looking for a page to put in a pagebuf 

Date:  Wed Aug  9 13:30:01 PDT 2000
Workarea:  jen.americas.sgi.com:/src/lord/xfs-linux.2.4.0-test5

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.0-test1-xfs


Modid:  2.4.0-test1-xfs:slinx:71710a
linux/include/linux/page_buf.h - 1.58
linux/fs/pagebuf/page_buf.c - 1.20
linux/fs/pagebuf/page_buf_locking.c - 1.5
        - Add some simple statistics to pagebuf



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