[lkml]   [2020]   [Sep]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 1/5] mm: Introduce mm_struct.has_pinned
On Mon, Sep 28, 2020 at 5:49 AM Jason Gunthorpe <> wrote:
> Not seeing an obvious option besides adding a smp_mb() before
> page_maybe_dma_pinned() as Peter once suggested.

That is going to be prohibitively expensive - needing it for each pte
whether it's pinned or not.

I really think the better option is a "don't do that then". This has
_never_ worked before either except by pure luck.

I also doubt anybody does it. forking with threads is a bad idea to
begin with. Doing so while pinning pages even more so.


 \ /
  Last update: 2020-09-28 18:18    [W:0.088 / U:9.160 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site