Re: [MiNT] STAT bits - Ouch!

[Alan Hourihane <alanh@fairlite.co.uk>]

On Thu, 2010-12-09 at 01:24 +0100, Konrad Kokoszkiewicz wrote:
> >>> Oh, and the other nice thing is this in our own code for ext2....
> >>>
> >>> # if EXT2_IFSOCK != S_IFSOCK
> >>>                if (EXT2_ISSOCK (mode))
> >>>                {
> >>>                        ptr->mode &= ~EXT2_IFSOCK;
> >>>                        ptr->mode |= S_IFSOCK;
> >>>                }
> >>> # endif
> >>>
> >>> The above is because if you bring in a filesystem from another Linux
> >>> machine that uses EXT2 we have to do conversion. Yuck.
> >>>
> >>> It makes sense to move to this "defacto" standard.
> >>
> >> No. ext2.xfs is a device driver, subordinate to the kernel. It has to do
> >> as many data conversions as it is necessary for the kernel and (if the
> >> data reaches the apps) applications.
> >
> > It's actually a performance enhancement by "not" having to do this.
> 
> Yes, but the conversion is not very heavy, the entire statement translates 
> to perhaps 8 assembler instructions, not more than 50 CPU clock ticks.

And this is the filesystem, so it can be called many times. Thus, any
saving is a performance boost regardless how small.

Alan.