linux-kernel - Re: [RFC v7 PATCH 2/4] mm: mmap: zap pages with read mmap

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Message-ID: <0594c845-68c8-e15f-6ec6-91641c5fbdd1@linux.alibaba.com>
Date:   Fri, 10 Aug 2018 11:26:14 -0700
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     mhocko@...nel.org, ldufour@...ux.vnet.ibm.com,
        kirill@...temov.name, vbabka@...e.cz, akpm@...ux-foundation.org,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v7 PATCH 2/4] mm: mmap: zap pages with read mmap_sem in
 munmap



On 8/10/18 10:57 AM, Matthew Wilcox wrote:
> On Fri, Aug 10, 2018 at 07:36:01AM +0800, Yang Shi wrote:
>> +/*
>> + * Zap pages with read mmap_sem held
>> + *
>> + * uf is the list for userfaultfd
>> + */
>> +static int do_munmap_zap_rlock(struct mm_struct *mm, unsigned long start,
>> +			       size_t len, struct list_head *uf)
> I don't like the name here.  We aren't zapping rlocks, we're zapping
> pages.  Not sure what to call it though ...

It may look ambiguous, it means "zap with rlock", but I don't think 
anyone would expect we are zapping locks.

Thanks,
Yang