linux-kernel - Re: [PATCH 0/3] eldie generated code for folded p4d/pud

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Message-ID: <20191010072952.GM2311@hirez.programming.kicks-ass.net>
Date:   Thu, 10 Oct 2019 09:29:52 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     linux-mm@...ck.org, linux-snps-arc@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, Will Deacon <will@...nel.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Piggin <npiggin@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 0/3] eldie generated code for folded p4d/pud

On Wed, Oct 09, 2019 at 03:26:55PM -0700, Vineet Gupta wrote:
> Hi,
> 
> This series elides extraneous generate code for folded p4d/pud.
> This came up when trying to remove __ARCH_USE_5LEVEL_HACK from ARC port.
> The code saving are not a while lot, but still worthwhile IMHO.
> 
> bloat-o-meter2 vmlinux-A-baseline vmlinux-E-elide-p?d_clear_bad
> add/remove: 0/2 grow/shrink: 0/1 up/down: 0/-146 (-146)
> function                                     old     new   delta
> p4d_clear_bad                                  2       -      -2
> pud_clear_bad                                 20       -     -20
> free_pgd_range                               546     422    -124
> Total: Before=4137148, After=4137002, chg -1.000000%
> 

Works for me, thanks!