Re: [PATCH RFC tools/lkmm 10/12] tools/memory-model: Add a S lock-based external-view litmus test

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, 21 Feb 2018, Paul E. McKenney wrote:

> > > +ISA2+pooncelock+pooncelock+pombonce.litmus
> > > +	Tests whether the ordering provided by a lock-protected S litmus
> > 
> > Call it an ISA2 litmus test, not an S litmus test!
> 
> Given the structure of the test, the relationship to S is important
> because it helps motivate why anyone might care.  But yes, having ISA2
> only in the filename is a bit obtuse.  How about the following?
> 
> ISA2+pooncelock+pooncelock+pombonce.litmus
> 	Tests whether the ordering provided by a lock-protected S
> 	litmus test is visible to an external process whose accesses are
> 	separated by smp_mb().	This addition of an external process to
> 	S is otherwise known as ISA2.

Okay, that's somewhat better.

However, I still don't understand why you think of this as a form of S.  
In S, the first variable written by P0 is the same as the variable
written by P1.  In this test, no variable other than the spinlock gets
written twice.  To me that seems like a pretty fundamental difference.

Alan




[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux