Re: [PATCH] Increase default MLOCK_LIMIT to 8 MiB
From: David Hildenbrand <hidden>
Date: 2021-11-24 13:32:10
Also in:
io-uring, linux-api, lkml
On 24.11.21 14:28, Jason Gunthorpe wrote:
On Wed, Nov 24, 2021 at 02:25:09PM +0100, David Hildenbrand wrote:quoted
On 24.11.21 14:23, Jason Gunthorpe wrote:quoted
On Wed, Nov 24, 2021 at 09:57:32AM +0100, David Hildenbrand wrote:quoted
Unfortunately it will only be a band aid AFAIU. I can rewrite my reproducer fairly easily to pin the whole 2M range first, pin a second time only a single page, and then unpin the 2M range, resulting in the very same way to block THP. (I can block some THP less because I always need the possibility to memlock 2M first, though).Oh! The issue is GUP always pins an entire compound, no matter how little the user requests.That's a different issue. I make sure to split the compound page before pinning anything :)?? Where is that done in GUP?
It's done in my reproducer manually. -- Thanks, David / dhildenb