On Wed, Dec 27, 2006 at 07:49:59PM -0800, Andrew Morton wrote: > On Thu, 28 Dec 2006 11:17:25 +0800 > "Zhang, Yanmin" <[EMAIL PROTECTED]> wrote: > > > Currently, by /proc/sys/vm/drop_caches, applications could drop pagecache, > > slab(dentries and inodes), or both, but applications couldn't choose to > > just drop the page cache of one file. An user of VOD (Video-On-Demand) > > needs this capability to have more detailed control on page cache release. > > The posix_fadvise() system call should be used for this. Probably in > combination with sys_sync_file_range().
Yanmin: I've been using the fadvise tool from http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz It's a nice tool: % fadvise Usage: fadvise filename offset length advice [loops] advice: normal sequential willneed noreuse dontneed asyncwrite writewait % fadvise /var/sparse 0 0x7fffffff dontneed Regards, Wu - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
