On Mon, Jan 13, 2020 at 4:29 PM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> From: Vlastimil Babka <vbabka@xxxxxxx>
> Subject: mm, thp: tweak reclaim/compaction effort of local-only and all-node allocations
I absolutely _detest_ how we've had this pattern of trying to change
the THP logic in a late -rc game.
Considering how unsuccessful some of the earlier attempts have been,
late -rc kernels really are *not* the time to make changes like this.
I'm going to take it this time, but
(a) I'm going to revert *immediately* if anybody even peeps about the
new behavior
(b) I want this to stop. Andrew - send THP "tweaks" during the merge
window, and not like some late-rc "fixes", when there are absolutely
_zero_ performance numbers or anything else critical associated with
the patch.
IOW, there is a decided lack of "bugfix" here. And if there actually
_were_ performance numbers, they should have been in the explanation.
So stop randomly messing with the THP allocation code, since it's
_known_ to be fragile with subtle side effects.
Linus
