[RFC] makedumpfile: exclude ZFS file cache pages

[RFC] makedumpfile: exclude ZFS file cache pages

[Donald Brady]

Hello,

I have for consideration a makedumpfile patch that can exclude the ZFS
file data cache pages. This is similar in capability as the exclusion
of the VFS page cache pages.

My question to this list is how to proceed?  Should I post a patch or
should I first explain how the ZFS pages are being marked and see if
others here can recommend a better approach?

Long term, ZFS should participate in the VFS page cache. However, that
is a significant change and won't be available in the foreseeable
future. There is an immediate benefit from excluding ZFS file cache
pages that will benefit crash dump users that use ZFS.

Thanks in advance for your help!
-Don

-- 
DON BRADY
Staff Engineer
Delphix.com

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RE: [RFC] makedumpfile: exclude ZFS file cache pages

[Kazuhito Hagio]

> -----Original Message-----
> From: kexec <kexec-bounces@lists.infradead.org> On Behalf Of Donald Brady
> Sent: Friday, July 19, 2019 3:44 PM
> To: kexec@lists.infradead.org
> Subject: [RFC] makedumpfile: exclude ZFS file cache pages
> 
> Hello,
> 
> I have for consideration a makedumpfile patch that can exclude the ZFS
> file data cache pages. This is similar in capability as the exclusion
> of the VFS page cache pages.
> 
> My question to this list is how to proceed?  Should I post a patch or
> should I first explain how the ZFS pages are being marked and see if
> others here can recommend a better approach?

Hi Don,

Either is OK, but I don't have any knowledge about ZFS implementation
so the explanation of that and what your patch is going to do will be
helpful at least for me to review/discuss it. And as you say, someone
here may be able to help.

Thanks,
Kazu

> 
> Long term, ZFS should participate in the VFS page cache. However, that
> is a significant change and won't be available in the foreseeable
> future. There is an immediate benefit from excluding ZFS file cache
> pages that will benefit crash dump users that use ZFS.
> 
> Thanks in advance for your help!
> -Don
> 
> --
> DON BRADY
> Staff Engineer
> Delphix.com
> 
> _______________________________________________
> kexec mailing list
> kexec@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec



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