linux-kernel - Re: [PATCH 0/2] Add explicit coredump filtering for DAX mappings

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Message-ID: <x49pp0fgaud.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 15 Oct 2015 16:01:30 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Jonathan Corbet <corbet@....net>, linux-nvdimm@...1.01.org,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	Matthew Wilcox <matthew.r.wilcox@...el.com>
Subject: Re: [PATCH 0/2] Add explicit coredump filtering for DAX mappings

Ross Zwisler <ross.zwisler@...ux.intel.com> writes:

> Add two new flags to the existing coredump mechanism for ELF files to allow
> us to explicitly filter DAX mappings.  This is desirable because DAX
> mappings, like hugetlb mappings, have the potential to be very large.
>
> The coredump code relies on get_user_page() to populate the coredump file
> with the appropriate data, and for DAX mappings this currently fails.  This
> results in a hole being placed in the coredump file, so you end up reading
> back zeros.  Once the get_user_pages() patch series from Dan Williams [1]
> is merged, DAX core dumps will give real data.
>
> I have a patch ready for core(5) to update the documentation on the new
> filtering flags.  I'll send it out once this gets merged.

Looks straight-forward.

Acked-by: Jeff Moyer <jmoyer@...hat.com>
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