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Date: Wed, 17 Dec 2014 13:44:21 -0600 (CST) From: Christoph Lameter <cl@...ux.com> To: Joonsoo Kim <js1304@...il.com> cc: Joonsoo Kim <iamjoonsoo.kim@....com>, akpm@...uxfoundation.org, Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Linux Memory Management List <linux-mm@...ck.org>, Pekka Enberg <penberg@...nel.org>, Jesper Dangaard Brouer <brouer@...hat.com> Subject: Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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