[Crash-utility] calling crash from another program (or vice versa)

[Chouinard, Luc]

Jim -

Indraneel Mukherjee (mukherjee.indraneel at gmail.com) posted these to the
lkcd mailing list some time ago. You might want to look at some of those
- there's one about mounts and one about SBs. 

Sial does not provide reentrancy back to crash. On the plus side, you
can pretty much cut&paste kernel code straight into you script, so you
don't have to be a kernel guru to get the info you want. A good source
of code is the /proc hooks that are employed throughout kernel and
driver code... :)


        -Luc
 

> -----Original Message-----
> From: crash-utility-bounces at redhat.com 
> [mailto:crash-utility-bounces at redhat.com] On Behalf Of James Washer
> Sent: Friday, December 11, 2009 6:29 PM
> To: Discussion "list for crash utility usage,maintenance and 
> development
> Subject: [Crash-utility] calling crash from another program 
> (or vice versa)
> 
> Often, I'd like to be able to run one crash command, massage 
> the data produced, and run follow up commands using the massaged data
> 
> A (possibly crazy) example, run the mount command, collect 
> the superblocks addresses, for each super_block, get the 
> s_inodes list head, traverse each list head to the inode, for 
> each inode, find it's i_data
> (address_space) and get the number of pages.. Now.. sum these 
> up and print a table of filesystem mounts points and the 
> number of cached pages for each... Perhaps, I'd even traverse 
> the struct pages to provide a count of clean and dirty pages 
> for each file system.
> 
> I do do this by hand. (i.e. mount > mount.file; perlscript 
> mount.file > crash-script-step-1, then, back in crash I do ". 
> crash-script-step-1 > data-file-2; and repeat with more 
> massaging).. This is gross, prone to error, and not terribly fast.
> 
> I'd love to start crash as a child of perl and either use 
> expect (which is a bit of a hack) or better yet, have some 
> machine interface to crash (ala gdbmi)...
> 
> I know.. it's open source, I should write it myself. I just 
> don't want to reinvent the wheel, if someone else already has 
> done something like this.
> 
> Perhaps I need to learn sial. But what little sial I've 
> looked at seems a bit low level for my needs.
> 
> Has anyone had much luck using expect with crash?
> 
> thanks
> 
>  - jim
> 
> 
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> 


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