Re: [RFC] fadvise: add more flags to provide a hint for block allocation

On Mon, Mar 05, 2012 at 08:26:03PM -0800, Sunil Mushran wrote:

On 3/5/2012 6:35 PM, Zheng Liu wrote:

quoted

No, _RANDOM means that file system doesn't need to try its best to find
a proper position to allocate some blocks for this file.  Furthermore,
currently random IOs seem that they are not obviously slower than
sequential IOs in Flash/SSD device.  For example, when users know a file
that is accessed infrequently, they can put this file in a corner, such
as in some discontinuously blocks.  Then sequential blocks are reserved
for the file that needs to be accessed frequently and users can obtain
the better performance.

Then FADV_ALLOC_HOT_REGION and FADV_ALLOC_COLD_REGION are
probably better terms.

Make sense to me. Thanks a lot. ;-)

Regards,
Zheng

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