linux-kernel - Re: [PATCH 07/32] mm: Bring back vmalloc

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Message-ID: <ZGHFa4AprPSsEpeq@moria.home.lan>
Date:   Mon, 15 May 2023 01:38:51 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Lorenzo Stoakes <lstoakes@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-bcachefs@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>, linux-mm@...ck.org
Subject: Re: [PATCH 07/32] mm: Bring back vmalloc_exec

On Sun, May 14, 2023 at 11:43:25AM -0700, Eric Biggers wrote:
> I think it would also help if the generated assembly had the handling of the
> fields interleaved.  To achieve that, it might be necessary to interleave the C
> code.

No, that has negligable effect on performance - as expected, for an out
of order processor. < 1% improvement.

It doesn't look like this approach is going to work here. Sadly.