netdev - Re: [PATCH 7/7] slub: initial bulk free implementation

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Message-ID: <alpine.DEB.2.11.1506151133150.20358@east.gentwo.org>
Date:	Mon, 15 Jun 2015 11:34:44 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: [PATCH 7/7] slub: initial bulk free implementation

On Mon, 15 Jun 2015, Jesper Dangaard Brouer wrote:

> +	for (i = 0; i < size; i++) {
> +		void *object = p[i];
> +
> +		if (unlikely(!object))
> +			continue; // HOW ABOUT BUG_ON()???

Sure BUG_ON would be fitting here.

> +
> +		page = virt_to_head_page(object);
> +		BUG_ON(s != page->slab_cache); /* Check if valid slab page */

This is the check if the slab page belongs to the slab cache we are
interested in.

> +
> +		if (c->page == page) {
> +			/* Fastpath: local CPU free */
> +			set_freepointer(s, object, c->freelist);
> +			c->freelist = object;
> +		} else {
> +			c->tid = next_tid(c->tid);

tids are only useful for the fastpath. No need to fiddle around with them
for the slowpath.

> +			local_irq_enable();
> +			/* Slowpath: overhead locked cmpxchg_double_slab */
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