Re: [RFC 0/6] Module for tracking/accounting shared memory buffers

From	Dave Hansen <dave.hansen@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [RFC 0/6] Module for tracking/accounting shared memory buffers
Date	2016-10-12 19:30 +0200
Message-ID	<srvvQ-7sZ-3@gated-at.bofh.it> (permalink)
References	<srf7H-4Py-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 10/11/2016 04:50 PM, Ruchi Kandoi wrote:
> Any process holding a reference to these buffers will keep the kernel from
> reclaiming its backing pages.  mm counters don't provide a complete picture of
> these allocations, since they only account for pages that are mapped into a
> process's address space.  This problem is especially bad for systems like
> Android that use dma-buf fds to share graphics and multimedia buffers between
> processes: these allocations are often large, have complex sharing patterns,
> and are rarely mapped into every process that holds a reference to them.

What do you end up _doing_ with all this new information that you have
here?  You know which processes have "pinned" these shared buffers, and
exported that information in /proc.  But, then what?

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[RFC 0/6] Module for tracking/accounting shared memory buffers Ruchi Kandoi <kandoiruchi@google.com> - 2016-10-12 02:00 +0200
  [RFC 1/6] fs: add installed and uninstalled file_operations Ruchi Kandoi <kandoiruchi@google.com> - 2016-10-12 02:00 +0200
  [RFC 4/6] memtrack: Adds the accounting to keep track of all mmaped/unmapped pages. Ruchi Kandoi <kandoiruchi@google.com> - 2016-10-12 02:00 +0200
  [RFC 5/6] memtrack: Add memtrack accounting for forked processes. Ruchi Kandoi <kandoiruchi@google.com> - 2016-10-12 02:00 +0200
  [RFC 6/6] drivers: staging: ion: add ION_IOC_TAG ioctl Ruchi Kandoi <kandoiruchi@google.com> - 2016-10-12 02:00 +0200
    Re: [RFC 6/6] drivers: staging: ion: add ION_IOC_TAG ioctl "Hillf Danton" <hillf.zj@alibaba-inc.com> - 2016-10-12 05:40 +0200
  [RFC 2/6] drivers: misc: add memtrack Ruchi Kandoi <kandoiruchi@google.com> - 2016-10-12 02:00 +0200
  Re: [RFC 0/6] Module for tracking/accounting shared memory buffers Al Viro <viro@ZenIV.linux.org.uk> - 2016-10-12 02:50 +0200
  Re: [RFC 0/6] Module for tracking/accounting shared memory buffers Rob Clark <robdclark@gmail.com> - 2016-10-12 03:20 +0200
  Re: [RFC 0/6] Module for tracking/accounting shared memory buffers Dave Hansen <dave.hansen@linux.intel.com> - 2016-10-12 19:30 +0200

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