Messages in this thread | | | Date | Thu, 15 Jun 2006 08:40:34 +0800 | From | Fengguang Wu <> | Subject | Re: [RFC] the /proc/filecache interface |
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Hi Bernard,
On Wed, Jun 14, 2006 at 11:38:37PM +0800, Bernard Blackham wrote: > I haven't been following this closely, so I apologise if I'm out of > my depth. It would be a useful add-on to be able to use this > interface to force something _out_ of the page cache also. For > example, for performance tests, or selectively ditching pages before > software suspending.
Sure we can add more related commands into it.
For example, the functions in fs/drop_caches.c are well suited for this interface. The current sysctl interface is a quick hacking:
/* A global variable is a bit ugly, but it keeps the code simple */ int sysctl_drop_caches;
The following scheme may be more reasonable:
# echo -n "drop files" > /proc/filecache # echo -n "drop slabs" > /proc/filecache
As for the "selectively ditching pages" function, my original scheme is to - query /proc/filecache to answer the question of "which pages are cached, and their status(referenced/active etc.)" - run "fadvise filename page-offset pages" to ditch pages Do you think it as convenient?
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