Re: [PATCH v2 2/4] mm: vmalloc: use rwsem, mutex for vmap_area_lock and vmap_block->lock

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To: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH v2 2/4] mm: vmalloc: use rwsem, mutex for vmap_area_lock and vmap_block->lock
From: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Date: Mon, 20 Mar 2023 08:40:40 +0000
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Baoquan He <bhe@xxxxxxxxxx>, Uladzislau Rezki <urezki@xxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Liu Shixin <liushixin2@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>
In-reply-to: <b4233383-2c87-422f-9f66-3815a6c77372@lucifer.local>

On Sun, Mar 19, 2023 at 09:16:18PM +0000, Lorenzo Stoakes wrote:
> On Sun, Mar 19, 2023 at 08:47:14PM +0000, Matthew Wilcox wrote:
> > I wonder if we can't do something like prefaulting the page before
> > taking the spinlock, then use copy_page_to_iter_atomic()
>
<snip>

On second thoughts, and discussing with Uladzislau, this seems like a more
sensible approach.

I'm going to respin with prefaulting and revert to the previous locking.

References:
- [PATCH v2 0/4] convert read_kcore(), vread() to use iterators
  - From: Lorenzo Stoakes
- [PATCH v2 2/4] mm: vmalloc: use rwsem, mutex for vmap_area_lock and vmap_block->lock
  - From: Lorenzo Stoakes
- Re: [PATCH v2 2/4] mm: vmalloc: use rwsem, mutex for vmap_area_lock and vmap_block->lock
  - From: Andrew Morton
- Re: [PATCH v2 2/4] mm: vmalloc: use rwsem, mutex for vmap_area_lock and vmap_block->lock
  - From: Lorenzo Stoakes
- Re: [PATCH v2 2/4] mm: vmalloc: use rwsem, mutex for vmap_area_lock and vmap_block->lock
  - From: Matthew Wilcox
- Re: [PATCH v2 2/4] mm: vmalloc: use rwsem, mutex for vmap_area_lock and vmap_block->lock
  - From: Lorenzo Stoakes

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