On Sun, 25 Mar 2007 23:10:21 +0200 Miklos Szeredi <[EMAIL PROTECTED]> wrote:
> This patch makes writing to shared memory mappings update st_ctime and > st_mtime as defined by SUSv3: Boy this is complicated. Is there a simpler way of doing all this? Say, we define a new page flag PG_dirtiedbywrite and we do SetPageDirtiedByWrite() inside write() and ClearPageDirtiedByWrite() whenever we propagate pte-dirtiness into page-dirtiness. Then, when performing writeback we look to see if any of the dirty pages are !PageDirtiedByWrite() and, if so, we update [mc]time to current-time. Or something like that - I'm just thinking out loud and picking holes in the above doesn't shut me up ;) We're adding complexity and some overhead and we're losing our recent msync() simplifications and this all hurts. Is there some other way? I think burning a page flag to avoid this additional complexity would be worthwhile. - 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/
