svn commit: r192859 - in head: share/man/man4 sys/conf sys/dev/ksyms sys/kern sys/modules sys/modules/ksyms sys/sys

[Kostik Belousov]

On Tue, May 26, 2009 at 09:39:09PM +0000, Stacey Son wrote:
> Author: sson
> Date: Tue May 26 21:39:09 2009
> New Revision: 192859
> URL: http://svn.freebsd.org/changeset/base/192859
> 
> Log:
>   Add the ksyms(4) pseudo driver.  The ksyms driver allows a process to
>   get a quick snapshot of the kernel's symbol table including the symbols
>   from any loaded modules (the symbols are all merged into one symbol
>   table).  Unlike like other implementations, this ksyms driver maps
>   memory in the process memory space to store the snapshot at the time
>   /dev/ksyms is opened.  It also checks to see if the process has already
>   a snapshot open and won't allow it to open /dev/ksyms it again until it
>   closes first.  This prevents kernel and process memory from being
>   exhausted.  Note that /dev/ksyms is used by the lockstat(1) command.
>   
>   Reviewed by:	gallatin kib (freebsd-arch)
>   Approved by:	gnn (mentor)

What is the reason to have ksyms_unmap() ? Why do you think that checking
for the present mapping of the freed region is neccessary ?
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