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Date: Fri, 05 Dec 2014 13:24:49 +0100 From: Arnd Bergmann <arnd@...db.de> To: Catalin Marinas <catalin.marinas@....com> Cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, Olof Johansson <olof@...om.net>, "agraf@...e.de" <agraf@...e.de>, Will Deacon <Will.Deacon@....com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] arm64: Enable CONFIG_COMPAT also for 64k page size On Friday 05 December 2014 11:05:07 Catalin Marinas wrote: > > > Should we add support for 64k-pages in the arm32 kernel as well now? > > 32-bit LPAE doesn't support 64K pages but IIRC the classic MMU does > (though I have to check whether it was optional). But it's not feasible > to enable this in a 32-bit environment because of the memory wasted with > large pages (on average 32KB per mapped file, possibly even more if you > have lots of small files). That sounds like a tradeoff that some users might be willing to make. I remember that with ps3-linux, a lot of people wanted to enable 64k-pages because the Cell processor has such a small number of TLB entries (256 or 1024), but Linux only has around 200MB of memory available. I believe there are arm32 machines with more RAM and fewer TLBs. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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