Messages in this thread |  | | | Date | Mon, 23 May 2011 13:21:22 +0300 | | Subject | Re: [bloat] Measuring header file bloat effects on kernel build performance: a more than 2x slowdown ... | | From | Alexey Dobriyan <> |
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On Mon, May 23, 2011 at 12:09 PM, Ingo Molnar <mingo@elte.hu> wrote: > 24594a2bfcaa: [PATCH] x86-64 merge > > - Remove some unneeded prefetches. Just two are enough to kickstart > the hardware prefetcher. > > But despite touching prefetches explicitly, this too sloppily left the (now > dangling) prefetch.h include file around.
Well, developer removes include, developer risks compile breakage.
> Anway, what i tried to demonstrate with this mail how much *real* slowdown in > the kernel build our current header file bloat is causing. We could literally > halve our kernel build times if we fixed this!
News at 11!
Ingo, you're running x86 compile tests nonstop, you can very well make asm-x86 headers the strictest ones to make problem less problematic.
You (x86 merge people), removed header guards from quite a lot of asm-x86/*.h files breaking gcc "do not open(2) second time" heuristics. It became better since last I've noticed it, but maybe start with that? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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