Understanding memory fragmentation in Linux kernel

Manish Katiyar mkatiyar at gmail.com
Mon Dec 31 01:22:57 EST 2018

On Sun, Dec 30, 2018, 10:03 PM Amit Agarwal <amit at amit-agarwal.co.in wrote:

> Hi All,
> I am trying to understand memory fragmentation and how to understand
> and/or analyze the same.
> Is there some detailed documentation on pagetypeinfo and buddyinfo files
> present in the proc directory? Am I looking at right files to understand if
> the memory is fragmented.
> Problem Description:
> One of the applications does a few 200-300Mb calloc's during start-up. On
> one of the production servers, the application does not start up although
> there should be enough RAM available for application to start. I am
> suspecting that this is because of fragmentation and would like to confirm
> the same.

How do you know it is because of memory ? If you have sufficient RAM then
it should be able to allocate. Does you application fail with ENOMEM ?

Without knowing the error code from application it's hard to suggest

> Thanks,
> -aka
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