On 07/18/2015 03:11 PM, Paul Gortmaker wrote:
On Tue, Jul 7, 2015 at 1:03 PM, Eric B Munson<emunson@xxxxxxxxxx> wrote:
>The cost of faulting in all memory to be locked can be very high when
>working with large mappings. If only portions of the mapping will be
>used this can incur a high penalty for locking.
>
>Now that we have the new VMA flag for the locked but not present state,
>expose it as an mmap option like MAP_LOCKED -> VM_LOCKED.
An automatic bisection on arch/tile leads to this commit:
5a5656f2c9b61c74c15f9ef3fa2e6513b6c237bb is the first bad commit
commit 5a5656f2c9b61c74c15f9ef3fa2e6513b6c237bb
Author: Eric B Munson<emunson@xxxxxxxxxx>
Date: Thu Jul 16 10:09:22 2015 +1000
mm: mmap: add mmap flag to request VM_LOCKONFAULT
Eric, I'm happy to help with figuring out the tile issues.
--
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com
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