Subject: How do I supress/shrink VM Page Cache for large files?
To: None <email@example.com, firstname.lastname@example.org>
From: None <Davef1624@aol.com>
Date: 06/13/2003 04:45:52
I've got an application that generates logging events
to a file-- this file continually grows and can consume
over 1 Gbyte of disk space.
Unfortunately, as the file grows, so does the VM Page Cache
(and as a result the free memory on my system approaches 0!).
For my application, I will *never* read back the file,
and all file write operations will always be sequential.
How can I either:
1) disable caching of such file system write-only operations
so that the VM Page Cache doesn't eat up memory?
2) Purge/shrink the VM Page Cache of all entries
for a particular vnode? Is there a routine to do this?
In genfs_getpages(), there is a call to uvn_findpages() --
which I believe eventually calls uvm_pagealloc() if the
page wasn't already in the page cache.
Would this be the reason the memory on my system
approaches 0 when write to large files?
Thanks for your help,