Information From Buffers

Information From Buffers

[Artur Baruchi]

Hi Guys.

I would like to get more information about how cache/buffers are being
used by kernel. Is there a way to walk through the buffer_head list
and get these details ?

Thanks in advance.

Artur Baruchi

Re: Information From Buffers

[Américo Wang]

On Fri, Oct 01, 2010 at 03:27:04PM -0300, Artur Baruchi wrote:
>Hi Guys.
>
>I would like to get more information about how cache/buffers are being
>used by kernel. Is there a way to walk through the buffer_head list
>and get these details ?
>

In /proc/meminfo, there are "Buffers" and "Cached" fields, are they
what you are looking for?

Re: Information From Buffers

[Artur Baruchi]

Hi Wang.

Thanks for your reply.

No, inside /proc/meminfo there are just high level information (macro)
about what is going on inside the memory. I need do get more details
about page cache, things like, what files are being buffered, how much
files are being buffered, size of this files, etc. This information
can be reach using buffer_head linked list, but I dont know how to
walk through this list.

Thanks.

Att.
Artur Baruchi


On Mon, Oct 4, 2010 at 7:12 AM, Américo Wang <xiyou.wangcong@gmail.com> wrote:
> On Fri, Oct 01, 2010 at 03:27:04PM -0300, Artur Baruchi wrote:
>>Hi Guys.
>>
>>I would like to get more information about how cache/buffers are being
>>used by kernel. Is there a way to walk through the buffer_head list
>>and get these details ?
>>
>
> In /proc/meminfo, there are "Buffers" and "Cached" fields, are they
> what you are looking for?
>

Re: Information From Buffers

[Américo Wang]

On Mon, Oct 04, 2010 at 08:04:24AM -0300, Artur Baruchi wrote:
>Hi Wang.
>
>Thanks for your reply.
>
>No, inside /proc/meminfo there are just high level information (macro)
>about what is going on inside the memory. I need do get more details
>about page cache, things like, what files are being buffered, how much
>files are being buffered, size of this files, etc. This information
>can be reach using buffer_head linked list, but I dont know how to
>walk through this list.
>


I see, seems we can't get this kind of informantion from /proc.

Oracle has a tool for this, check:

http://oss.oracle.com/projects/codefragments/dist/files/pagecache-info/pagecache-info

Hope it can help.

Thanks.

Re: Information From Buffers

[Artur Baruchi]

Hi Americo.

This is fine. I run in my 2.6 kernel machine but didnt work (It works
only for kernel 2.4),  but it is a good starting point.

Thanks!

Att.
Artur Baruchi


On Wed, Oct 6, 2010 at 7:23 AM, Américo Wang <xiyou.wangcong@gmail.com> wrote:
> On Mon, Oct 04, 2010 at 08:04:24AM -0300, Artur Baruchi wrote:
>>Hi Wang.
>>
>>Thanks for your reply.
>>
>>No, inside /proc/meminfo there are just high level information (macro)
>>about what is going on inside the memory. I need do get more details
>>about page cache, things like, what files are being buffered, how much
>>files are being buffered, size of this files, etc. This information
>>can be reach using buffer_head linked list, but I dont know how to
>>walk through this list.
>>
>
>
> I see, seems we can't get this kind of informantion from /proc.
>
> Oracle has a tool for this, check:
>
> http://oss.oracle.com/projects/codefragments/dist/files/pagecache-info/pagecache-info
>
> Hope it can help.
>
> Thanks.
>