Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: kmalloc() allocation. | Date | 30 Oct 2000 21:28:04 -0800 |
| |
Followup to: <Pine.LNX.3.95.1001030133720.3346A-100000@chaos.analogic.com> By author: "Richard B. Johnson" <root@chaos.analogic.com> In newsgroup: linux.dev.kernel > > > 64K probably less. kmalloc allocates physically linear spaces. vmalloc will > > happily grab you 2Mb of space but it will not be physically linear > > > > Okay. Thanks. >
FWIW, vmalloc()-allocated pages are definitely pinned-down and available to interrupts. However, you should keep in mind that the vmalloc() call *itself* is quite expensive on SMP machines (have to interrupt all CPUs and flush their TLBs!!) so if you're using vmalloc(), be careful with the number of calls you make. Of course, this is usually not a problem.
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
| |