On Tue, Oct 5, 2010 at 8:26 PM, Mitani <mit...@ryobi.co.jp> wrote:
>> -----Original Message-----
>> From: Garrett Cooper [mailto:yaneg...@gmail.com]
>> Sent: Sunday, October 03, 2010 10:02 AM
>> To: Mitani
>> Cc: ltp-list@lists.sourceforge.net
>> Subject: Re: [LTP] About "hugeshmat01" and "humeshmget03" testsets
>>
>> On Tue, Sep 28, 2010 at 9:40 PM, Mitani <mit...@ryobi.co.jp> wrote:
>> >> -----Original Message-----
>> >> From: Garrett Cooper [mailto:yaneg...@gmail.com]
>> >> Sent: Tuesday, September 07, 2010 4:04 PM
>> >> To: Mitani
>> >> Cc: ltp-list@lists.sourceforge.net
>> >> Subject: Re: [LTP] About "hugeshmat01" and "humeshmget03" testsets
>> >>
>> >> On Mon, Sep 6, 2010 at 11:53 PM, Mitani <mit...@ryobi.co.jp> wrote:
>> >> > Hi,
>> >> >
>> >> > I sent patches of "hugeshmat01" and "humeshmget03" testsets to
>> >> mailing-list
>> >> > in the middle of August, but they aren't updated.
>> >> > Would you teach me what kind of situation they are?
>> >> >
>> >> > hugeshmat01:
>> >>
>> > http://www.mail-archive.com/ltp-list@lists.sourceforge.net/m
>> >> sg10448.html
>> >> > humeshmget03:
>> >>
>> > http://www.mail-archive.com/ltp-list@lists.sourceforge.net/m
>> >> sg10467.html
>> >> >
>> >> > (The "humeshmat01" was revised on August 16, but same failure
>> has
>> >> > occurred in my system.)
>> >> >
>> >> > I am glad if I can get some information about the patch.
>> >> > I'm looking forward to reply:-)
>> >>
>> >> Sorry... another item I forgot to follow up on. I'll look into
>> >> this over the next couple of days and provide feedback about this.
>> >> Thanks,
>> >> -Garrett
>> >
>> > Were my revisions OK?
>> > I am glad if you consider about these patches when you are free.
>>
>> 1. Where's the requirement noted that you added the code for in
>> hugeshmget03 ?
>> 2. How do you know the value added to hugeshmat01 isn't page aligned?
>> Why not get the page size from sysconf and subtract the value from
>> one, and add _that_ value?
>>
>> Thanks,
>> -Garrett
>
>
>>1. Where's the requirement noted that you added the code for in
> hugeshmget03 ?
>
> It is in follwing URL in August 13:
> http://www.mail-archive.com/ltp-list@lists.sourceforge.net/msg10467.html
>
>
>>2. How do you know the value added to hugeshmat01 isn't page aligned?
>
> It is in follwing URL in August 09:
> http://www.mail-archive.com/ltp-list@lists.sourceforge.net/msg10448.html
> http://www.mail-archive.com/ltp-list@lists.sourceforge.net/msg10532.html
>
> The reason that hugeshmat01 isn't page aligned is from the shmat()'s
> error code 22 (EINVAL).
> shmat()'s man page says about this error code:
> ------------
> EINVAL The value of shmid is not a valid shared memory identifier,
> the shmaddr
> is not a null pointer, and the value of (shmaddr
> -((uintptr_t)shmaddr
> %SHMLBA)) is an illegal address for attaching shared
> memory; or the
> shmaddr is not a null pointer, (shmflg &SHM_RND) is 0, and
> the value of
> shmaddr is an illegal address for attaching shared memory.
> ------------
>
> The failure occurred in following shmat():
> ---(hugeshmat01.c)---------
> [...]
> for (i=0; i<TST_TOTAL; i++) {
>
> /*
> * Use TEST macro to make the call
> */
> errno = 0;
> addr = shmat(*(TC[i].shmid), (void *)(TC[i].addr),
> TC[i].flags);
> [...]
> ------------
>
> This failure occurred in second loop (i=1), and arguments of shmat()
> are as follows:
> ------------
> shmat(id, 0x10000000eee, SHM_RND)
> ------------
>
> "shmaddr" argument (second argument) of shmat() is not NULL. Therefore
> I thought that page aligned occurred.
>
>
>>Why not get the page size from sysconf and subtract the value from one, and
> add _that_ value?
>
> This value is dynamic address, and this is the value which the first shmat()
> returned.
> This is the value with achievement in the each users system at least.
> When a fixed address ("0x10000000eee" or "0x60000eee") was specified,
> depending on a case, this address may be the address which other processes
> use.
> I thought that this method of using dynamic address is better than
> using fixed value to "shmaddr" argument.
If you have links to official documentation from your copy of
RHEL's kernel / glibc sources I could reference, that would be much
appreciated.
Thanks,
-Garrett
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