Messages in this thread | | | From | Daniel Phillips <> | Subject | Re: [RFC] Page table sharing | Date | Tue, 19 Feb 2002 03:22:21 +0100 |
| |
On February 19, 2002 03:05 am, Linus Torvalds wrote: > On Mon, 18 Feb 2002, Rik van Riel wrote: > > > > The swapout code can remove a page from the page table > > while another process is in the process of unsharing > > the page table. > > Ok, I'll buy that. However, looking at that, the locking is not the real > issue at all: > > When the swapper does a "ptep_get_and_clear()" on a shared pmd, it will > end up having to not just synchronize with anybody doing unsharing, it > will have to flush all the TLB's on all the mm's that might be implicated. > > Which implies that the swapper needs to look up all mm's some way anyway,
Ick. With rmap this is straightforward, but without, what? flush_tlb_all? Maybe page tables should be unshared on swapin/out after all, only on arches that need special tlb treatment, or until we have rmap.
> so the locking gets solved that way.
-- Daniel - 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/
| |