![]() | |||||||||||||
Messages in this thread |
On Wed, Feb 25, 2004 at 04:04:19PM -0500, Daniel Phillips wrote: Very cool! > This is the function formerly known as invalidate_mmap_range, with the > addition of a new code path in the zap_ call chain to handle MAP_PRIVATE > properly. This function by itself is enough to support a crude but useful > form of distributed mmap where a shared file is cached only on one cluster > node at a time. > > To use this, the distributed filesystem has to hook do_no_page to intercept > page faults and carry out the needed global locking. The locking itself does > not require any new kernel hooks. In brief, the patch here and another patch > to be presented for the do_no_page hook, together provide the core kernel API > for a simplified, distributed mmap. (Note that there may be a workaround for > the lack of a do_no_page hook, but certainly not as simple and robust.) > > To put this in perspective, I'll mention the two big limitations of the > simplified API: > > 1) Invalidation is always a whole file at a time I must be missing something subtle here... It looks to me like the new unmap_mapping_range() API is capable of invalidating portions of files, based on the "start" and "length" arguments. What am I missing? Thanx, Paul - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2005-03-22 13:01 [from the cache] ©2003-2008 | |||||||||||||