linux-kernel - Re: [PATCH 0/7] minmax: reduce compilation time

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Message-ID: <2f1be7ee-2d70-4dd3-bfa2-1b94a4fc5a66@lucifer.local>
Date: Sat, 27 Jul 2024 09:07:24 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Linus Torvalds <torvalds@...uxfoundation.org>
Cc: David Laight <David.Laight@...lab.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Arnd Bergmann <arnd@...nel.org>, "Jason@...c4.com" <Jason@...c4.com>,
        "pedro.falcato@...il.com" <pedro.falcato@...il.com>,
        Mateusz Guzik <mjguzik@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/7] minmax: reduce compilation time

On Fri, Jul 26, 2024 at 08:21:31PM GMT, Lorenzo Stoakes wrote:
[snip]
> I might try an allmodconfig with David's patches to see if that pulls out any
> other really obvious cases.

I did this last night but didn't want to spam too much. This shows the delta on
pre-processed file size before/after David's patch set which should give a good
indication for min/max combinatorial explosion.

There's a lot of noise from staging drivers but also a bunch from other
places. Might be fun to run Linus's longest line thing on these and see what
pops out too...

I enclose the full list. Interestingly we see an _increase_ in some file sizes
with the patches. But not too many (they show negative delta).

...
1768108./fs/xfs/libxfs/xfs_trans_resv.o.pre
2354450./drivers/staging/media/atomisp/pci/isp/kernels/gc/gc_1.0/ia_css_gc.host.o.pre
2354694./drivers/net/ethernet/intel/iavf/iavf_main.o.pre
2419455./drivers/net/ethernet/marvell/mvneta.o.pre
3119381./drivers/staging/media/atomisp/pci/sh_css_params.o.pre
3476319./drivers/staging/media/atomisp/pci/isp/kernels/tnr/tnr_1.0/ia_css_tnr.host.o.pre
3490399./drivers/staging/media/atomisp/pci/isp/kernels/bh/bh_2/ia_css_bh.host.o.pre
3494239./drivers/staging/media/atomisp/pci/isp/kernels/de/de_1.0/ia_css_de.host.o.pre
4621996./drivers/staging/media/atomisp/pci/isp/kernels/bnr/bnr_1.0/ia_css_bnr.host.o.pre
4623276./drivers/staging/media/atomisp/pci/isp/kernels/ob/ob2/ia_css_ob2.host.o.pre
5445036./drivers/staging/media/atomisp/pci/isp/kernels/wb/wb_1.0/ia_css_wb.host.o.pre
8503041./drivers/staging/media/atomisp/pci/isp/kernels/s3a/s3a_1.0/ia_css_s3a.host.o.pre
11322234./drivers/staging/media/atomisp/pci/isp/kernels/dp/dp_1.0/ia_css_dp.host.o.pre
21096020./drivers/net/ethernet/marvell/mvpp2/mvpp2_main.o.pre
45254333./arch/x86/xen/setup.o.pre
62603617./drivers/staging/media/atomisp/pci/isp/kernels/ynr/ynr_1.0/ia_css_ynr.host.o.pre

View attachment "allmodconfig_delta.txt" of type "text/plain" (1106579 bytes)