On 02/27/2012 04:19 PM, Dave Kleikamp wrote:
This patchset was begun by Zach Brown and was originally submitted for review in October, 2009.
Man, it's been a while. I remembered almost none of the details of this work when I read your introductory message. As I read the patches it all came flooding back, though. Yikes :). My biggest fear about this patch series is the sheer amount of very fiddly code motion. I remember spending a lot of time verifying that the patches didn't accidentally lose new changes as the patches were ported to newer kernels. Has someone gone through these most recent patches with an absurdly fine toothed comb? The patches that touch fs/direct-io.c and mm/filemap.c are the most risky, by far.
This series was written to reduce the current overhead loop imposes by performing synchronus buffered file system IO from a kernel thread. These patches turn loop into a light weight layer that translates bios into iocbs.
It'd be worth including some simple benchmark results, I think. I remember testing with concurrent O_DIRECT aio with fio on a loopback device on top of files in each underlying file system. - z -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
