On Mon, 26 Mar 2007 16:10:09 -0500 Matt Mackall <[EMAIL PROTECTED]> wrote:
> On Mon, Mar 26, 2007 at 02:00:36PM -0700, Andrew Morton wrote: > > 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. > > Aren't we basically out of those? Rafael has liberated a couple of the flags which swsusp was using. - 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/
