On Wed, 17 Dec 2014, Christoph Lameter wrote:
> On Wed, 17 Dec 2014, Joonsoo Kim wrote:
>
> > + do {
> > + tid = this_cpu_read(s->cpu_slab->tid);
> > + c = this_cpu_ptr(s->cpu_slab);
> > + } while (IS_ENABLED(CONFIG_PREEMPT) && unlikely(tid != c->tid));
Here is another one without debugging:
0xffffffff811d23bb <+59>: mov %gs:0x8(%r9),%rdx tid(rdx) = this_cpu_read()
0xffffffff811d23c0 <+64>: mov %r9,%r8
0xffffffff811d23c3 <+67>: add %gs:0x7ee37d9d(%rip),%r8 c (r8) =
0xffffffff811d23cb <+75>: cmp 0x8(%r8),%rdx c->tid == tid
0xffffffff811d23cf <+79>: jne 0xffffffff811d23bb <kmem_cache_alloc+59>
Actually that looks ok.
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