Re: [RFC][PATCH v3] slub: Keep page and object in sync in slab_alloc_node()
From: Eric Dumazet <hidden>
Date: 2013-01-18 19:09:56
Also in:
linux-mm, lkml
On Fri, 2013-01-18 at 18:40 +0000, Christoph Lameter wrote:
The fetching of the tid is the only critical thing here. If the tid is retrieved from the right cpu then the cmpxchg will fail if any changes occured to freelist or the page variable. The tid can be retrieved without disabling preemption through this_cpu_read().
Strictly speaking, this_cpu_read() _does_ disable preemption. Of course, on x86, this_cpu_read() uses __this_cpu_read() -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>