linux-kbuild.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Rob Herring <robh@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/3] kbuild: Add a build check for missing gitignore entries
Date: Tue, 23 Feb 2021 17:59:17 -0600	[thread overview]
Message-ID: <CAL_JsqLNVy4KHSViVWePermXsG1K_W=Buj8a1wxQ1pdEVYFr3w@mail.gmail.com> (raw)
In-Reply-To: <CAHk-=wiWoqUt5z0Phvr-0HQkohi2SkYRPuCGi0xefV0KE+t4kA@mail.gmail.com>

On Tue, Feb 23, 2021 at 5:20 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> On Tue, Feb 23, 2021 at 10:14 AM Rob Herring <robh@kernel.org> wrote:
> >
> > Any non-phony targets need to be in gitignore. The normal way to check
> > this is doing an in-tree build and running git-status which is easy to
> > miss. Git provides an easy way to check whether a file is ignored with
> > git-check-ignore. Let's add a build time check using it.
>
> This looks ridiculously expensive with a shell and git invocation for
> every single target just for this check.

I was a bit worried too initially, but casually didn't notice any
difference so I didn't do any measurements. Now I have, and it looks
like it adds about 2 sec on a rebuild with no changes. I probably can
rework it to a single shell and git call per invocation of
Makefile.lib. What I really need is git-check-ignore to take '-n'
without '-v', but grep can solve that.

Here's the raw data:

clean x86 defconfig:
1805.08user 165.87system 5:05.15elapsed 645%CPU (0avgtext+0avgdata
260180maxresident)k
110536inputs+1390704outputs (11major+52491225minor)pagefaults 0swaps

rebuild with no changes:
12.61user 3.56system 0:04.32elapsed 374%CPU (0avgtext+0avgdata
38876maxresident)k
0inputs+1984outputs (0major+755708minor)pagefaults 0swaps

adding this commit and rebuild:
14.90user 4.80system 0:06.50elapsed 303%CPU (0avgtext+0avgdata
39160maxresident)k
80inputs+1992outputs (0major+1402830minor)pagefaults 0swaps

clean x86 defconfig with this commit:
1799.10user 165.84system 5:06.19elapsed 641%CPU (0avgtext+0avgdata
259932maxresident)k
8inputs+1390712outputs (0major+53146757minor)pagefaults 0swaps

another rebuild with this commit:
14.55user 4.85system 0:06.14elapsed 315%CPU (0avgtext+0avgdata
38664maxresident)k
0inputs+1992outputs (0major+1402878minor)pagefaults 0swaps

Rob

  reply	other threads:[~2021-02-24  1:06 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 18:14 [PATCH 0/3] Build time gitignore checking Rob Herring
2021-02-23 18:14 ` [PATCH 1/3] kbuild: Make old-atomics and missing-syscalls phony targets Rob Herring
2021-02-24  0:43   ` Masahiro Yamada
2021-02-24  1:12     ` Rob Herring
2021-02-23 18:14 ` [PATCH 2/3] x86: Drop generated syscall headers from 'targets' Rob Herring
2021-02-24  0:47   ` Masahiro Yamada
2021-02-23 18:14 ` [PATCH 3/3] kbuild: Add a build check for missing gitignore entries Rob Herring
2021-02-23 23:19   ` Linus Torvalds
2021-02-23 23:59     ` Rob Herring [this message]
2021-02-24  1:14       ` Masahiro Yamada
2021-02-24 11:26   ` Geert Uytterhoeven

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAL_JsqLNVy4KHSViVWePermXsG1K_W=Buj8a1wxQ1pdEVYFr3w@mail.gmail.com' \
    --to=robh@kernel.org \
    --cc=bp@alien8.de \
    --cc=hpa@zytor.com \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@kernel.org \
    --cc=masahiroy@kernel.org \
    --cc=michal.lkml@markovi.net \
    --cc=mingo@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).