Messages in this thread | | | Date | Fri, 12 Jun 2009 11:52:06 +0200 | From | Nick Piggin <> | Subject | Re: [PATCH v2] slab,slub: ignore __GFP_WAIT if we're booting or suspending |
| |
On Fri, Jun 12, 2009 at 12:49:17PM +0300, Pekka Enberg wrote: > On Fri, Jun 12, 2009 at 12:10 PM, Ingo Molnar<mingo@elte.hu> wrote: > >> @@ -1548,6 +1548,20 @@ new_slab: > >> goto load_freelist; > >> } > >> > >> + /* > >> + * Lets not wait if we're booting up or suspending even if the user > >> + * asks for it. > >> + */ > >> + if (system_state != SYSTEM_RUNNING) > >> + gfpflags &= ~__GFP_WAIT; > > > > Hiding that bug like that is not particularly clean IMO. We should > > not let system_state hacks spread like that. > > > > We emit a debug warning but dont crash, so all should be fine and > > the culprits can then be fixed, right? > > OK, lets not use system_state then and go with Ben's approach then. > Again, neither of the patches are about "hiding buggy callers" but > changing allocation policy wrt. gfp flags during boot (and later on > during suspend).
Maybe if we just not make it a general "tweak gfpflag" bit (at least not until a bit more discussion), but a specific workaround for the local_irq_enable in early boot problem.
Seems like it would not be hard to track things down if we add a warning if we have GFP_WAIT and interrupts are not enabled...
-- 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/
| |