Re: [yocto] prelink-cross with -fno-plt

[Shane Peelar]

Will do, thanks!

On Sat, Jun 1, 2019, 3:50 PM Mark Hatle,  wrote:

> Thanks, this shows that the prelinking is still working in this case.
> I'll get
> you patch queued up.  If you don't see any progress on it this coming week,
> please feel free to remind me.
>
> --Mark
>
> On 5/29/19 1:42 PM, Shane Peelar wrote:
> > Hi Mark,
> >
> > Thank you for your reply and no problem -- I chose to benchmark ssh-add
> with
> > it.  It contains no `.plt`.
> >
> > The results are as follows:
> >
> > Without prelink (ran prelink -auv):
> >
> >  26019:
> >  26019: runtime linker statistics:
> >  26019:   total startup time in dynamic loader: 1321674 cycles
> >  26019: time needed for relocation: 797948 cycles
> (60.3%)
> >  26019:  number of relocations: 624
> >  26019:   number of relocations from cache: 3
> >  26019: number of relative relocations: 9691
> >  26019:time needed to load objects: 389972 cycles
> (29.5%)
> > Could not open a connection to your authentication agent.
> >  26019:
> >  26019: runtime linker statistics:
> >  26019:final number of relocations: 630
> >  26019: final number of relocations from cache: 3
> >
> > With prelink (ran prelink -av):
> >
> >   1930:
> >   1930: runtime linker statistics:
> >   1930:   total startup time in dynamic loader: 462288 cycles
> >   1930: time needed for relocation: 48730 cycles
> (10.5%)
> >   1930:  number of relocations: 7
> >   1930:   number of relocations from cache: 134
> >   1930: number of relative relocations: 0
> >   1930:time needed to load objects: 286076 cycles
> (61.8%)
> > Could not open a connection to your authentication agent.
> >   1930:
> >   1930: runtime linker statistics:
> >   1930:final number of relocations: 9
> >   1930: final number of relocations from cache: 134
> >
> > I also tested against execstack, which for sure had the assertion fire
> on.
> > Without prelink:
> >
> >  27736:
> >  27736: runtime linker statistics:
> >  27736:   total startup time in dynamic loader: 1955954 cycles
> >  27736: time needed for relocation: 755440 cycles
> (38.6%)
> >  27736:  number of relocations: 247
> >  27736:   number of relocations from cache: 3
> >  27736: number of relative relocations: 1353
> >  27736:time needed to load objects: 710384 cycles
> (36.3%)
> > /usr/bin/execstack: no files given
> >  27736:
> >  27736: runtime linker statistics:
> >  27736:final number of relocations: 251
> >  27736: final number of relocations from cache: 3
> >
> > With prelink:
> >
> >   3268:
> >   3268: runtime linker statistics:
> >   3268:   total startup time in dynamic loader: 1421206 cycles
> >   3268: time needed for relocation: 199396 cycles
> (14.0%)
> >   3268:  number of relocations: 3
> >   3268:   number of relocations from cache: 88
> >   3268: number of relative relocations: 0
> >   3268:time needed to load objects: 696886 cycles
> (49.0%)
> > /usr/bin/execstack: no files given
> >   3268:
> >   3268: runtime linker statistics:
> >   3268:final number of relocations: 5
> >   3268: final number of relocations from cache: 88
> >
> > So, it looks like prelink is working on these :)
> >
> > On Tue, May 28, 2019 at 2:57 PM Mark Hatle  > > wrote:
> >
> > Sorry for my delayed reply.  I was out on a business trip.
> >
> > Did you try this with the ld.so statistics to see if the relocations
> were indeed
> > reduced at runtime?
> >
> > One of my worries with these changes (since I am not an ELF expert
> either) is
> > that we make a change that doesn't actually do anything -- but
> people expect
> > it to.
> >
> > $ LD_DEBUG=help /lib/ld-linux.so.2
> > Valid options for the LD_DEBUG environment variable are:
> >
> >   libsdisplay library search paths
> >   reloc   display relocation processing
> >   files   display progress for input file
> >   symbols display symbol table processing
> >   bindingsdisplay information about symbol binding
> >   versionsdisplay version dependencies
> >   scopes  display scope information
> >   all all previous options combined
> >   statistics  display relocation statistics
> >   unused  determined unused DSOs
> >   helpdisplay this help message and exit
> >
> > To direct the debugging output into a file instead of standard output
> > a filename can be specif

Re: [yocto] do_rootfs fails while attempting to install hostapd package

[Belisko Marek]

On Sat, Jun 1, 2019 at 8:26 PM Morné Lamprecht  wrote:
>
> >I would check run.do_rootfs and check it maybe
> >there will be some more info.
>
> I checked it based on your suggestion,
> unfortunately found no relevant info.
>
> >Do you have some custom extension for hostapd?
>
> No, just the standard package.
Which startup system do you use (sysVinit or systemd)?
You can take a look at poky/meta/classed/update-rc.d.bbclass which
checks various parameters and try to debug it (by adding some
printouts).
By my guess is that some misconfiguration between systemd/sysvinit
must cause this issue. Thanks.
>
> - Morné

BR,

marek

-- 
as simple and primitive as possible
-
Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
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skype: marekwhite
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