From: Muli Ben-Yehuda (mulix_at_nonexisting.hamakor.org.il)
Date: Wed 12 Jan 2005 - 11:57:08 IST
On Wed, Jan 12, 2005 at 02:39:03AM +0200, Tzahi Fadida wrote:
> Well, it seems right. I am not sure if its all the io disk calls though.
> The code is not easy to read but it seems this is the same data
> that /proc/stat -> page line uses thru kstat.pgpgout.
> I am looking at what seems to be the point where this happens,
> at the file drivers/block/ll_rw_blk.c at function -
> void submit_bh(int rw, struct buffer_head * bh) .
> Is there a way to pull this data out without recompiling the kernel?
Depending on what data you mean, probably not.
> If not, I believe the proper way of getting out the data is to put it in
> proc in something like - /proc/<pid>/statio
> How do I do that? just create a regular file or is it something
> else?
Look for how other proc files are created in the kernel. It requires a
little bit of kernel code. Also see http://lwn.net/Kernel/LDD2/
> Ultimately I will need to read it with my c program.
You can read and parse the output you get from laptop mode.
> here is some output of the dmesg, the blocks seems to be after the "/"
> and I will need to sum them up for each process. although, it uses the
> name
> instead of PIDs so I'll need to figure out also where are the PIDs,
> I am guessing current->pid.
Right.
> also, by my understanding the dirtied buffer
> relate to memory and swap file? and not directly to files?
Which kernel version are you looking at?
A dirtied buffer will have to be flushed to disk at some point, that's
why it's interesting.
Cheers,
Muli
-- Muli Ben-Yehuda http://www.mulix.org | http://mulix.livejournal.com/
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