Re: [RFC] [PATCH 3/6] Kprobes: New interfaces for user-space probes

[Christoph Hellwig <hch@infradead.org>]

On Tue, May 09, 2006 at 12:35:08PM +0530, Prasanna S Panchamukhi wrote:
> This patch provides two interfaces to insert and remove
> user space probes. Each probe is uniquely identified by
> inode and offset within that executable/library file.
> Insertion of a probe involves getting the code page for
> a given offset, mapping it into the memory and then inserting
> the breakpoint at the given offset. Also the probe is added
> to the uprobe_table hash list. A uprobe_module data structure
> is allocated for every probed application/library image on disk.
> Removal of a probe involves getting the code page for a given
> offset, mapping that page into the memory and then replacing
> the breakpoint instruction with a the original opcode.
> This patch also provides aggregate probe handler feature,
> where user can define multiple handlers per probe.

This introduces interfaces that aren't used anywhere in the following
patches.  That is completely not acceptable.  Please provide a proper
userspace interface to this functionality, e.g. something based on the
RPN code from Richard's dprobes.