From: Christoph Hellwig <hch@lst.de>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Yosry Ahmed <yosry.ahmed@linux.dev>,
Vitaly Wool <vitaly.wool@konsulko.se>,
linux-mm@kvack.org, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org, Nhat Pham <nphamcs@gmail.com>,
Shakeel Butt <shakeel.butt@linux.dev>,
Johannes Weiner <hannes@cmpxchg.org>,
Minchan Kim <minchan@kernel.org>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Igor Belousov <igor.b@beldev.am>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] mm/zblock: use vmalloc for page allocations
Date: Tue, 6 May 2025 15:37:06 +0200 [thread overview]
Message-ID: <20250506133706.GA29215@lst.de> (raw)
In-Reply-To: <aBoOVajBDXkFNUBI@gondor.apana.org.au>
On Tue, May 06, 2025 at 09:27:49PM +0800, Herbert Xu wrote:
> On Tue, May 06, 2025 at 01:13:17PM +0000, Yosry Ahmed wrote:
> >
> > Keep in mind that zswap_decompress() will always do an extra copy if the
> > address returned by zpool_obj_read_begin() is a vmalloc address. To
> > avoid this we need to enlighten the scatterlist API to work with vmalloc
> > addresses.
> >
> > (CC'ing Herbert as he was looking into this)
>
> acomp now supports linear addresses so vmalloc can be sent through
> directly. It will fail if you use hardware offload though since
> you can't DMA directly to vmalloc virtual addresses.
You absolutely can and lots of code does.
next prev parent reply other threads:[~2025-05-06 13:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-02 8:01 [PATCH] mm/zblock: use vmalloc for page allocations Vitaly Wool
2025-05-02 8:07 ` Igor Belousov
2025-05-03 18:46 ` Vitaly Wool
2025-05-04 5:02 ` Sergey Senozhatsky
2025-05-04 6:14 ` Sergey Senozhatsky
2025-05-05 14:08 ` Johannes Weiner
2025-05-06 2:13 ` Sergey Senozhatsky
2025-05-05 14:29 ` Johannes Weiner
2025-05-06 9:42 ` Uladzislau Rezki
2025-05-06 13:13 ` Yosry Ahmed
2025-05-06 13:27 ` Herbert Xu
2025-05-06 13:37 ` Christoph Hellwig [this message]
2025-05-07 5:57 ` Sergey Senozhatsky
2025-05-07 6:08 ` Sergey Senozhatsky
2025-05-07 6:14 ` Sergey Senozhatsky
2025-05-07 6:54 ` Christoph Hellwig
2025-05-08 5:58 ` Sergey Senozhatsky
2025-05-08 6:00 ` Christoph Hellwig
2025-05-08 6:17 ` Sergey Senozhatsky
2025-05-08 6:33 ` Sergey Senozhatsky
2025-05-07 8:50 ` Uladzislau Rezki
2025-05-08 6:07 ` Sergey Senozhatsky
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