> > @@ -202,15 +199,27 @@ static long region_chg(struct resv_map *resv, long f, > > long t) > > * Subtle, allocate a new region at the position but make it zero > > * size such that we can guarantee to record the reservation. */ > > if (&rg->link == head || t < rg->from) { > > - nrg = kmalloc(sizeof(*nrg), GFP_KERNEL); > > - if (!nrg) > > - return -ENOMEM; > > + if (!nrg) { > > + nrg = kmalloc(sizeof(*nrg), GFP_NOWAIT); > > + if (!nrg) { > > + spin_unlock(&resv->lock); > > + nrg = kmalloc(sizeof(*nrg), GFP_KERNEL); > > + if (!nrg) { > > + chg = -ENOMEM; > > + goto out; > > Just return -ENOMEM here.
Okay. It looks better! > > > + } > > + goto retry; > > + } > > + } > > + > > You seem to be right, at least in my workloads, the hold times for the > region lock is quite small, so a spinlock is better than a sleeping > lock. > > That said, this code is quite messy, but I cannot think of a > better/cleaner approach right now. Okay. Thanks for review! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/