From: Gary Benson <gbenson@redhat.com>
To: Pedro Alves <palves@redhat.com>
Cc: "Joel Brobecker" <brobecker@adacore.com>,
"Doug Evans" <dje@google.com>,
"Jan Kratochvil" <jan.kratochvil@redhat.com>,
gdb-patches <gdb-patches@sourceware.org>,
"Sandra Loosemore" <sandra@codesourcery.com>,
"André Pönitz" <apoenitz@t-online.de>,
"Paul Koning" <Paul_Koning@dell.com>
Subject: Re: [PATCH 0/2] Better handling of slow remote transfers
Date: Wed, 12 Aug 2015 13:02:00 -0000 [thread overview]
Message-ID: <20150812130248.GA15429@blade.nx> (raw)
In-Reply-To: <55CB4150.6090807@redhat.com>
Pedro Alves wrote:
> On 08/12/2015 01:32 PM, Gary Benson wrote:
> > Pedro Alves wrote:
> > > IIUC, it still auto fetches the executable and then the solibs
> > > from the target by default (e.g., after "attach"), so still
> > > subject to lack of interruptibility?
> >
> > Yes and no. It will fetch the executable from the remote iff one
> > has not been otherwise specified (i.e. by "file", or on the
> > command line). It will *only* fetch libraries from the remote if
> > the parent executable has a target prefix. So:
> >
> > (gdb) file a.out
> > (gdb) target remote :9999
> >
> > - exec_filename is "a.out"
> > - exec_filename has no "target:" prefix
> > - "target:" prefix is NOT applied to shared libraries
> > - solib paths end up as "/path/to/libsolib.so.1"
> > - solibs are NOT fetched over RSP
> >
>
> But to me it looks like GDB _should_ retrieve the libraries out of
> the target in this case. You'll usually have a local copy of the
> executable, because you just compiled it, but not of the shared
> libraries. It seems to me we're only considering this option
> because we didn't make transfers interruptible?
Right, but users who have been doing that will be using "set sysroot
remote:":
(gdb) file a.out
(gdb) set sysroot remote:
(gdb) target remote :9999
- gdb_sysroot is "target:"
- solib paths end up as "target:/path/to/libsolib.so.1"
- solibs ARE fetched over RSP
This series basically means that:
a) users get to type whatever they were typing before and have the
same thing happen, with the exception of the 0.001% of users who
have been typing "target remote :9999" with no "file" or "set sysroot"
commands and debugging with no symbols whatsoever.
b) those users can add "set auto-target-prefix off" in their .gdbinit
c) users who want GDB to connect to a remote target and Just Work
get to type "target remote :9999" without messing about with
"file" and "set sysroot" commands.
> > > I was only OK with trying to make transfers interruptible in the
> > > branch assuming it was something non-invasive, like a missing
> > > QUIT here and there.
> >
> > No, gdbserver sends the data in PBUFSIZ chunks, but GDB reads the
> > data a character at a time.
>
> Can you expand on this? What code is it that reads the data a
> character at a time? What data is gdb getting at when it does that?
I was looking in getpkt_or_notif_sane_1, but I think maybe I misread
it. I'll get back to you on this...
Cheers,
Gary
--
http://gbenson.net/
next prev parent reply other threads:[~2015-08-12 13:02 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-11 17:22 Doug Evans
2015-08-11 18:55 ` Jan Kratochvil
2015-08-11 19:44 ` Doug Evans
2015-08-11 19:59 ` Joel Brobecker
2015-08-12 9:48 ` Gary Benson
2015-08-12 10:10 ` Pedro Alves
2015-08-12 10:38 ` Gary Benson
2015-08-12 11:29 ` Pedro Alves
2015-08-12 12:32 ` Gary Benson
2015-08-12 12:51 ` Pedro Alves
2015-08-12 13:02 ` Gary Benson [this message]
2015-08-12 13:34 ` Pedro Alves
2015-08-12 13:38 ` Gary Benson
2015-08-12 13:44 ` Gary Benson
2015-08-12 13:58 ` Pedro Alves
2015-08-12 14:44 ` Pedro Alves
2015-08-12 15:08 ` Gary Benson
2015-08-12 15:31 ` Pedro Alves
2015-08-12 15:45 ` Gary Benson
2015-08-12 13:29 ` Gary Benson
2015-08-14 18:26 ` Joel Brobecker
2015-08-14 22:26 ` Sandra Loosemore
2015-08-16 18:49 ` Joel Brobecker
2015-08-17 8:53 ` Gary Benson
2015-08-17 14:26 ` Sandra Loosemore
2015-08-18 9:59 ` Gary Benson
2015-08-18 16:52 ` Sandra Loosemore
2015-08-19 1:27 ` Pedro Alves
2015-08-19 10:41 ` [PATCH] Prelimit number of bytes to read in "vFile:pread:" Gary Benson
2015-08-19 10:51 ` Gary Benson
2015-08-19 12:00 ` Pedro Alves
2015-08-19 16:43 ` Sandra Loosemore
2015-08-19 17:21 ` Gary Benson
2015-08-19 21:14 ` Sandra Loosemore
2015-08-20 14:48 ` Pedro Alves
2015-08-20 15:52 ` Pedro Alves
2015-08-20 17:00 ` Pedro Alves
2015-08-20 18:23 ` Sandra Loosemore
2015-08-21 14:52 ` [PATCH] remote: allow aborting long operations (e.g., file transfers) (Re: [PATCH] Prelimit number of bytes to read in "vFile:pread:") Pedro Alves
2015-08-21 17:12 ` Sandra Loosemore
2015-08-21 17:27 ` Pedro Alves
2015-08-25 10:57 ` Pedro Alves
2015-08-25 15:36 ` Pedro Alves
2015-08-25 20:19 ` GDB 7.10 release tentative date: Fri Aug 28 (was: "Re: [PATCH] remote: allow aborting long operations (e.g., file transfers) (Re: [PATCH] Prelimit number of bytes to read in "vFile:pread:")") Joel Brobecker
2015-08-24 8:45 ` [PATCH] remote: allow aborting long operations (e.g., file transfers) (Re: [PATCH] Prelimit number of bytes to read in "vFile:pread:") Gary Benson
2015-08-19 11:44 ` [PATCH] Prelimit number of bytes to read in "vFile:pread:" Pedro Alves
2015-08-19 13:07 ` [pushed] " Gary Benson
2015-08-19 13:42 ` [PATCH 0/2] Better handling of slow remote transfers Gary Benson
2015-08-20 14:46 ` Pedro Alves
2015-08-20 18:01 ` Gary Benson
2015-08-21 9:34 ` [pushed] Add readahead cache to gdb's vFile:pread (Re: [PATCH 0/2] Better handling of slow remote transfers) Pedro Alves
2015-08-11 20:00 ` [PATCH 0/2] Better handling of slow remote transfers Jan Kratochvil
2015-08-12 10:05 ` Pedro Alves
-- strict thread matches above, loose matches on Subject: below --
2015-08-05 15:28 Gary Benson
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