On 04/19/2012 03:20 PM, Theodore Ts'o wrote:
As I had brought up during one of the lightning talks at the Linux
Storage and Filesystem workshop, I am interested in introducing two new
open flags, O_HOT and O_COLD. These flags are passed down to the
individual file system's inode operations' create function, and the file
system can use these flags as a hint regarding whether the file is
likely to be accessed frequently or not.
In the future I plan to do further work on how ext4 would use these
flags, but I want to first get the ability to pass these flags plumbed
into the VFS layer and the code points for O_HOT and O_COLD reserved.
Theodore Ts'o (3):
fs: add new open flags O_HOT and O_COLD
fs: propagate the open_flags structure down to the low-level fs's
create()
ext4: use the O_HOT and O_COLD open flags to influence inode
allocation
Full-file seems awfully coarse-grained. What about doing this at page
granularity, and hint via VM as well as block layer?
Jeff
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