Priotizing pages to be swapped-out

[Sushanth Rai]

I looked at these but they don't quite match what I'm hoping for. Basically, in our system we soft partition the memory among applications based on their expected usage. Sometimes, applications can consume bit more than expected and we end up swapping, which is okay. Short of mlock'ing the memory, I was looking for a way where an application can advise the kernel that if it has to swap-out, consider these set of pages after everything else has been looked at. The hope is that some not-so-important application's pages get swapped and that would meet the paging requirements with touching the pages of "privileged" application.

Thanks,
Sushanth



________________________________
 From: Wojciech Puchar <wojtek at wojtek.tensor.gdynia.pl>
To: Edward Tomasz Napierała <trasz at FreeBSD.org> 
Cc: Sushanth Rai <sushanth_rai at yahoo.com>; "freebsd-hackers at freebsd.org" <freebsd-hackers at freebsd.org> 
Sent: Friday, April 25, 2014 4:59 AM
Subject: Re: Priotizing pages to be swapped-out
 

MADV_DONTNEED

as well as MADV_SEQUENTIAL



On Thu, 24 Apr 2014, Edward Tomasz Napierała wrote:

> Wiadomość napisana przez Sushanth Rai w dniu 22 kwi 2014, o godz. 23:05:
>> Is there any mechanism for a privileged user application to provide a hint to kernel to prioritize some user pages to be swapped-out later (after all the "lower" priority pages have been swapped-out)
>
> See madvise(2), perhaps?
>
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