linux-kernel - Re: [PATCH V2,0/2]mm: madvise: return correct bytes processed with process

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Message-ID: <3b1626e7-3a32-5733-2a4f-e782c87b8e58@quicinc.com>
Date:   Tue, 15 Mar 2022 19:56:05 +0530
From:   Charan Teja Kalla <quic_charante@...cinc.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <surenb@...gle.com>, <vbabka@...e.cz>, <rientjes@...gle.com>,
        <sfr@...b.auug.org.au>, <edgararriaga@...gle.com>,
        <minchan@...nel.org>, <nadav.amit@...il.com>, <mhocko@...e.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2,0/2]mm: madvise: return correct bytes processed with
 process_madvise

Thanks Andrew!!

On 3/12/2022 3:12 AM, Andrew Morton wrote:
>> With the process_madvise(), always choose to return non zero processed
>> bytes over an error. This can help the user to know on which VMA, passed
>> in the 'struct iovec' vector list, is failed to advise thus can take the
>> decission of retrying/skipping on that VMA.
> Thanks, this is not good.
> 
> We should have added userspace tests for process_madvise() along with
> the syscall itself.  But evidently that was omitted.  If someone
> decides to contribute such tests, hopefully they will include checks
> for these return values.

We are happy to contribute here.

>