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[209.85.220.41]) by mx.google.com with SMTPS id 186sor10883727vsy.62.2019.05.22.08.17.36 for (Google Transport Security); Wed, 22 May 2019 08:17:36 -0700 (PDT) Received-SPF: pass (google.com: domain of dancol@google.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=iBWci38m; spf=pass (google.com: domain of dancol@google.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=dancol@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=85/xp1LLQ/Gq2RJYWYYuF9b0tPNRLe+Qag7yBp7mWAc=; b=iBWci38mGhcli5wl56IPjiVCAofYwzUm4VCJt87rQIGMSzAXm/QAy94eFgEFu8rUce 2NBGu1/wkdaHaRcgpPfNmplL8dhDXjTVblDzenDcR0W+w6pUL9obwUeRHAVKQLcZoXYF GuCdoBXre8W4MP86eIDrkksZYa1fEFrxAcO9jXA7sAl9bJllqYSc5wJa1iAdguUqvdlf OuBrz86GYBbuxVW87BTcDE3HQS59eTVvXENFhOHWENHDbM0HUJ39W2JzfNV16r7l/wgO oj0farWsUo773EVjgFU5QmbjsDTQlf1c11zA1tw7d8iG5F7UYd4mxj4QI+EKJufJaBpc YTuQ== X-Google-Smtp-Source: APXvYqwY3fllxdUsIb9pMNHzQvevbLB7gTfbyxHIV/lLfYAFC6DFS71u+U2Zbq2qGndivpbq5Z7rOI0NonYCw87UG3I= X-Received: by 2002:a67:e1d3:: with SMTP id p19mr31572261vsl.183.1558538255715; Wed, 22 May 2019 08:17:35 -0700 (PDT) MIME-Version: 1.0 References: <20190520035254.57579-1-minchan@kernel.org> <20190521084158.s5wwjgewexjzrsm6@brauner.io> <20190521110552.GG219653@google.com> <20190521113029.76iopljdicymghvq@brauner.io> <20190521113911.2rypoh7uniuri2bj@brauner.io> <20190522145216.jkimuudoxi6pder2@brauner.io> In-Reply-To: <20190522145216.jkimuudoxi6pder2@brauner.io> From: Daniel Colascione Date: Wed, 22 May 2019 08:17:23 -0700 Message-ID: Subject: Re: [RFC 0/7] introduce memory hinting API for external process To: Christian Brauner Cc: Minchan Kim , Andrew Morton , LKML , linux-mm , Michal Hocko , Johannes Weiner , Tim Murray , Joel Fernandes , Suren Baghdasaryan , Shakeel Butt , Sonny Rao , Brian Geffon , Jann Horn Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, May 22, 2019 at 7:52 AM Christian Brauner wrote: > I'm not going to go into yet another long argument. I prefer pidfd_*. Ok. We're each allowed our opinion. > It's tied to the api, transparent for userspace, and disambiguates it > from process_vm_{read,write}v that both take a pid_t. Speaking of process_vm_readv and process_vm_writev: both have a currently-unused flags argument. Both should grow a flag that tells them to interpret the pid argument as a pidfd. Or do you support adding pidfd_vm_readv and pidfd_vm_writev system calls? If not, why should process_madvise be called pidfd_madvise while process_vm_readv isn't called pidfd_vm_readv?