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From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Alexey Dobriyan <adobriyan@gmail.com>,
	Rafael David Tinoco <rafael.tinoco@linaro.org>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, shuah@kernel.org
Subject: Re: [PATCH] proc: fixup map_files test on arm
Date: Mon, 12 Nov 2018 18:55:59 +0300	[thread overview]
Message-ID: <20181112155559.GV13195@uranus.lan> (raw)
In-Reply-To: <20181112141456.GA15690@avx2>

On Mon, Nov 12, 2018 at 05:14:57PM +0300, Alexey Dobriyan wrote:
...
> > >  int main(void)
> > >  {
> > >  	const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
> > > +#ifdef __arm__
> > > +	unsigned long va = 2 * PAGE_SIZE;
> > > +#else
> > > +	unsigned long va = 0;
> > > +#endif
...
> > 
> > I have sent a patch removing proc-self-map-files-002 AND making 001 to use as a
> > HINT for mmap (MAP_FIXED) *at least*  *(2 * PAGE_SIZE), which would, likely,
> > attend all  architectures, avoiding trying to make the test specific to one,
> > and, still, test the symlinks for issues (like bad chars, spaces, so on).
> 
> If the goal is to test the lowest address then going for 2*PAGE_SIZE is
> a mistake.
> 
> Which BTW hints to add a test for the highest address.
> 
> > Both tests (001 and 002) have pretty much the same code, while they could have 2
> > tests in a single code, using kselftest framework. Is NULL hint + MAP_FIXED
> > something imperative for this test ? Why not to have all in a single test ?
> 
> I dislike tests which lump everything together into one process.
> 
> > Are you keeping the NULL hint just to test mmap, apart" from the core of
> > this test ?

Guys, lets simply stick with Alexey's patch. I personnally think that
testing mappings should be a separate test in vm/, but seriously this
took too long already :) If Alexey's patch fixes the problem with arm
I think we're fine.

WARNING: multiple messages have this Message-ID
From: gorcunov at gmail.com (Cyrill Gorcunov)
Subject: [PATCH] proc: fixup map_files test on arm
Date: Mon, 12 Nov 2018 18:55:59 +0300	[thread overview]
Message-ID: <20181112155559.GV13195@uranus.lan> (raw)
In-Reply-To: <20181112141456.GA15690@avx2>

On Mon, Nov 12, 2018 at 05:14:57PM +0300, Alexey Dobriyan wrote:
...
> > >  int main(void)
> > >  {
> > >  	const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
> > > +#ifdef __arm__
> > > +	unsigned long va = 2 * PAGE_SIZE;
> > > +#else
> > > +	unsigned long va = 0;
> > > +#endif
...
> > 
> > I have sent a patch removing proc-self-map-files-002 AND making 001 to use as a
> > HINT for mmap (MAP_FIXED) *at least*  *(2 * PAGE_SIZE), which would, likely,
> > attend all  architectures, avoiding trying to make the test specific to one,
> > and, still, test the symlinks for issues (like bad chars, spaces, so on).
> 
> If the goal is to test the lowest address then going for 2*PAGE_SIZE is
> a mistake.
> 
> Which BTW hints to add a test for the highest address.
> 
> > Both tests (001 and 002) have pretty much the same code, while they could have 2
> > tests in a single code, using kselftest framework. Is NULL hint + MAP_FIXED
> > something imperative for this test ? Why not to have all in a single test ?
> 
> I dislike tests which lump everything together into one process.
> 
> > Are you keeping the NULL hint just to test mmap, apart" from the core of
> > this test ?

Guys, lets simply stick with Alexey's patch. I personnally think that
testing mappings should be a separate test in vm/, but seriously this
took too long already :) If Alexey's patch fixes the problem with arm
I think we're fine.

WARNING: multiple messages have this Message-ID
From: gorcunov@gmail.com (Cyrill Gorcunov)
Subject: [PATCH] proc: fixup map_files test on arm
Date: Mon, 12 Nov 2018 18:55:59 +0300	[thread overview]
Message-ID: <20181112155559.GV13195@uranus.lan> (raw)
Message-ID: <20181112155559.UTtP6X6FikMRHeeyH-mL19ovvyCgtcBjEq_vUBQY1mI@z> (raw)
In-Reply-To: <20181112141456.GA15690@avx2>

On Mon, Nov 12, 2018@05:14:57PM +0300, Alexey Dobriyan wrote:
...
> > >  int main(void)
> > >  {
> > >  	const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
> > > +#ifdef __arm__
> > > +	unsigned long va = 2 * PAGE_SIZE;
> > > +#else
> > > +	unsigned long va = 0;
> > > +#endif
...
> > 
> > I have sent a patch removing proc-self-map-files-002 AND making 001 to use as a
> > HINT for mmap (MAP_FIXED) *at least*  *(2 * PAGE_SIZE), which would, likely,
> > attend all  architectures, avoiding trying to make the test specific to one,
> > and, still, test the symlinks for issues (like bad chars, spaces, so on).
> 
> If the goal is to test the lowest address then going for 2*PAGE_SIZE is
> a mistake.
> 
> Which BTW hints to add a test for the highest address.
> 
> > Both tests (001 and 002) have pretty much the same code, while they could have 2
> > tests in a single code, using kselftest framework. Is NULL hint + MAP_FIXED
> > something imperative for this test ? Why not to have all in a single test ?
> 
> I dislike tests which lump everything together into one process.
> 
> > Are you keeping the NULL hint just to test mmap, apart" from the core of
> > this test ?

Guys, lets simply stick with Alexey's patch. I personnally think that
testing mappings should be a separate test in vm/, but seriously this
took too long already :) If Alexey's patch fixes the problem with arm
I think we're fine.

  reply	other threads:[~2018-11-12 15:56 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-10 18:49 Alexey Dobriyan
2018-11-11  2:48 ` Rafael David Tinoco
2018-11-11  2:48   ` Rafael David Tinoco
2018-11-11  2:48   ` rafael.tinoco
2018-11-12 14:14   ` Alexey Dobriyan
2018-11-12 14:14     ` Alexey Dobriyan
2018-11-12 14:14     ` adobriyan
2018-11-12 15:55     ` Cyrill Gorcunov [this message]
2018-11-12 15:55       ` Cyrill Gorcunov
2018-11-12 15:55       ` gorcunov
2018-11-12 16:35       ` Rafael David Tinoco
2018-11-12 16:35         ` Rafael David Tinoco
2018-11-12 16:35         ` rafael.tinoco
2018-11-13 16:54         ` [PATCH v2] " Alexey Dobriyan
2018-11-13 16:54           ` Alexey Dobriyan
2018-11-13 16:54           ` adobriyan
2018-11-13 17:01           ` Cyrill Gorcunov
2018-11-13 17:01             ` Cyrill Gorcunov
2018-11-13 17:01             ` gorcunov

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