jimb is currently certified at Master level.

Name: Jim Blandy
Member since: 2000-11-15 21:15:57
Last Login: 2008-06-11 15:57:06

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Homepage: http://www.red-bean.com/jimb


I've been working on Free software since 1990. I've been the maintainer of GNU Emacs and Guile, Project GNU's extension language library. Now I work for Red Hat on GDB. I was one of the original designers of Subversion.

I'm generally interested in anything having to do with programming languages, from the theory down to the bits.

I live in Portland, Oregon, in the United States. The winters here are great for staying inside and reading books.


Recent blog entries by jimb

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Yay, set up a Trac instance for the Linux kernel tracepoint stuff.

I'm working on adding support for GDB tracepoints to KGDB, a GDB stub for the Linux kernel. Essentially, a tracepoint is like a breakpoint except that, when you hit a tracepoint, the stub records some data that you specify (using arbitrary C expressions; you can deference pointers, index arrays, refer to structure members, etc.) in a log, and then immediately continues the program, without communicating with GDB. Then you can examine log hits with GDB; GDB acts as if the selected hit's recorded data were "live". If you log a hundred bytes or so off the top of the stack, you can even get backtraces.

I'd like to get a Trac site set up for it, so people can see what I'm doing.

I wonder --- would it be possible to provide Dwarf CFI data for the IRQ handlers, so you could unwind through IRQ's?

This week goes mostly to Red Hat --- I need to get a GDB release together for a customer.

However, I think I've figured out how to present a pretty nice interface in the Subversion filesystem library for building transactions. A transaction will behave just like a revision: it's a directory tree, which you can browse using the normal filesystem API. However, unlike a revision's tree, which is permanent and unchanging, a transaction's tree is mutable --- you can use additional functions to create, delete and modify nodes as you please. When you've munged the tree to your satisfaction, you can commit the transaction; if there are no conflicts, the transaction's tree becomes a new revision of the filesystem.

This will require some fancy logic, mostly to conceal the sharing of nodes between a transaction and extant, committed revisions, but it should make the interface consistent and easy to learn. And hopefully make it simpler to implement WebDAV's `activities' on top of the Subversion filesystem.


jimb certified others as follows:

  • jimb certified mjs as Master
  • jimb certified gjbadros as Master
  • jimb certified blume as Master
  • jimb certified bkorb as Journeyer
  • jimb certified fitz as Journeyer

Others have certified jimb as follows:

  • cmm certified jimb as Master
  • gstein certified jimb as Master
  • sh certified jimb as Master
  • dlr certified jimb as Master
  • pate certified jimb as Master
  • Fyndo certified jimb as Master
  • mwh certified jimb as Master
  • fitz certified jimb as Master
  • mvw certified jimb as Master
  • mjs certified jimb as Master
  • sussman certified jimb as Master
  • bkorb certified jimb as Master
  • walters certified jimb as Master
  • mvo certified jimb as Master
  • jay certified jimb as Master
  • brane certified jimb as Master
  • proski certified jimb as Master
  • tromey certified jimb as Master
  • abraham certified jimb as Master
  • madscientist certified jimb as Master
  • wsanchez certified jimb as Master
  • brouhaha certified jimb as Master
  • graydon certified jimb as Master

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