Re: [PATCH 0/3] Fadvise: Directory level page cache cleaning support

From: Dave Hansen
Date: Mon Dec 30 2013 - 14:18:50 EST

On 12/30/2013 05:45 AM, Li Wang wrote:
> This patch extends 'fadvise' to support directory level page cache
> cleaning. The call to posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED)
> with 'fd' referring to a directory will recursively reclaim page cache
> entries of files inside 'fd'. For secruity concern, those inodes
> which the caller does not own appropriate permissions will not
> be manipulated.

Why is this necessary to do in the kernel? Why not leave it to
userspace to walk the filesystem(s)?

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