On Wednesday 11 July 2007 10:54, Zan Lynx wrote: > Jesper Juhl wrote: > > Hi, > > > > I'm wondering if it's time to make 4K stacks the default and to start > > considering removing the 8K stack option alltogether soon? > > > > One of the big problem spots was XFS, but that got some stack usage > > fixes recently, and the 4K stack option has been around for quite a > > while now, so people really should have gotten around to fixing any > > code that can't handle it. Are there still any big problem areas > > remaining? > > Has anyone fixed the infrequent crashes with 4K stacks and ext3 -> LVM > snapshot -> LVM -> DM mirror -> libata?
Ahem: ext3 -> LVM snapshot -> LVM -> DM mirror -> DM crypt -> md -> libata, or worse. No, it's not fixed. The model is wrong. Virtual block drivers should not be callling submit_bio. The recursive IO submissions should be handled on a dedicated stack, most probably allocated as part of the request queue. This could be done easily in device mapper and md, or better, in submit_bio. Regards, Daniel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
