Messages in this thread | | | Date | Tue, 12 Nov 2002 22:59:51 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: [PATCH] flush_cache_page while pte valid |
| |
On Tue, 12 Nov 2002, David S. Miller wrote:
> From: Hugh Dickins <hugh@veritas.com> > Date: Tue, 12 Nov 2002 17:43:40 +0000 (GMT) > > Sorry, I still don't get it. If the flush_cache_page is doing something > necessary, then won't a user access in between it and invalidating pte > undo what was necessary? And if it's not necessary, why do we do it? > (For better performance would be a very good reason.) > > If there are other writable mappings of the page, we can't swap > it out legally.
But I'm worried about the case where this is the last writable mapping: it seems userspace (on another CPU) can still write to it in between the flush_cache_page and invalidation of the pte (on this CPU hoping to swap out that page).
Hugh
- 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/
| |