linux-kernel - Re: [PATCH] mm: huge_memory: don't force huge page alignment on 32 bit

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Date: Fri, 19 Jan 2024 00:16:34 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Yang Shi <shy828301@...il.com>
Cc: jirislaby@...nel.org, surenb@...gle.com, riel@...riel.com, cl@...ux.com,
	akpm@...ux-foundation.org, yang@...amperecomputing.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: huge_memory: don't force huge page alignment on 32
 bit

On Thu, Jan 18, 2024 at 10:05:05AM -0800, Yang Shi wrote:
> From: Yang Shi <yang@...amperecomputing.com>
> 
> The commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP
> boundaries") caused two issues [1] [2] reported on 32 bit system or compat
> userspace.
> 
> It doesn't make too much sense to force huge page alignment on 32 bit
> system due to the constrained virtual address space.
> 
> [1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/
> [2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/
> 
> Fixes: efa7df3e3bb5 ("mm: align larger anonymous mappings on THP boundaries")
> Reported-by: Jiri Slaby <jirislaby@...nel.org>
> Reported-by: Suren Baghdasaryan <surenb@...gle.com>
> Tested-by: Jiri Slaby <jirislaby@...nel.org>
> Tested-by: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Rik van Riel <riel@...riel.com>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Christopher Lameter <cl@...ux.com>
> Signed-off-by: Yang Shi <yang@...amperecomputing.com>

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>