Messages in this thread | | | Date | Wed, 17 Dec 2014 13:44:21 -0600 (CST) | From | Christoph Lameter <> | Subject | Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1 |
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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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