linux-kernel - Re: [PATCH v2 2/5] mm: parallel free pages

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Message-ID: <20170315115440.GE2442@aaronlu.sh.intel.com>
Date:   Wed, 15 Mar 2017 19:54:40 +0800
From:   Aaron Lu <aaron.lu@...el.com>
To:     Hillf Danton <hillf.zj@...baba-inc.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        'Dave Hansen' <dave.hansen@...el.com>,
        'Tim Chen' <tim.c.chen@...el.com>,
        'Andrew Morton' <akpm@...ux-foundation.org>,
        'Ying Huang' <ying.huang@...el.com>
Subject: Re: [PATCH v2 2/5] mm: parallel free pages

On Wed, Mar 15, 2017 at 05:42:42PM +0800, Hillf Danton wrote:
> 
> On March 15, 2017 5:00 PM Aaron Lu wrote: 
> >  void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
> >  {
> > +	struct batch_free_struct *batch_free, *n;
> > +
> s/*n/*next/
> 
> >  	tlb_flush_mmu(tlb);
> > 
> >  	/* keep the page table cache within bounds */
> >  	check_pgt_cache();
> > 
> > +	list_for_each_entry_safe(batch_free, n, &tlb->worker_list, list) {
> > +		flush_work(&batch_free->work);
> 
> Not sure, list_del before free?

I think this is a good idea, it makes code look saner.
I just did a search of list_for_each_entry_safe and found list_del is
usually(I didn't check every one of them) used before free.

So I'll add that in the next revision, probably some days later in case
there are other comments.

Thanks for your time to review the patch.

Regards,
Aaron
 
> > +		kfree(batch_free);
> > +	}
> > +
> >  	tlb_flush_mmu_free_batches(tlb->local.next, true);
> >  	tlb->local.next = NULL;
> >  }
> 
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