lkml.org 
[lkml]   [2010]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: linux-next: add utrace tree
Date
>>>>> "Linus" == Linus Torvalds <torvalds@linux-foundation.org> writes:

Linus> No. There is absolutely _no_ reason to believe that gdb et al would ever
Linus> delete the ptrace interfaces anyway.

Yes, in GDB we approximately never delete anything.

Nevertheless, if the Linux kernel were to present a new user-space API,
and if it had an advantage over ptrace, then we would port GDB to use
it. There are other platforms where, IIRC, we now use some /proc thing
instead of ptrace.

There are definitely things we would like from such an API. Here's a
few I can think of immediately, there are probably others.

* Use an fd, not SIGCHLD+wait, to report inferior state changes to gdb.
Internally we're already using a self-pipe to integrate this into
gdb's main loop. Relatedly, don't mess with the inferior's parentage.

* Support "displaced stepping" in the kernel; I think this would improve
performance when debugging in non-stop mode.

* Support some kind of breakpoint expression in the kernel; this would
improve performance of conditional breakpoints. Perhaps the existing
gdb agent expressions could be used.

Tom


\
 
 \ /
  Last update: 2010-01-25 22:09    [W:0.225 / U:17.368 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site