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From: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
To: David Hildenbrand <david@redhat.com>
Cc: linux-man@vger.kernel.org,
	Alejandro Colomar <alx.manpages@gmail.com>,
	 Michael Kerrisk <mtk.manpages@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Michal Hocko <mhocko@suse.com>,
	Oscar Salvador <osalvador@suse.de>, Jann Horn <jannh@google.com>,
	 Mike Rapoport <rppt@kernel.org>,
	Linux API <linux-api@vger.kernel.org>,
	 Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH v1] madvise.2: Document MADV_POPULATE_READ and MADV_POPULATE_WRITE
Date: Mon, 12 Jul 2021 12:17:52 +0200	[thread overview]
Message-ID: <CAM9Jb+gmCTdbVYX3+Y9F_KRNnYkGNGQvGRJRCBkJX6wjyzmpQQ@mail.gmail.com> (raw)
In-Reply-To: <406695f0-13c8-a052-92d4-44e884eb44af@redhat.com>

> >> +.BR MADV_POPULATE_WRITE " (since Linux 5.14)
> >> +Populate (prefault) page tables writable for the whole range without actually
> >> +writing. Depending on the underlying mapping, preallocate memory or read the
> >
> > Is this read or write?
> > just reading and trying to understand :)
>
> It's reading. Assume you have a file with existing content mapped into a
> process. Once you touch a page (read/write/execute) that maps to blocks
> with existing content, you'll have to load these blocks from disk first.

Got it. Thanks for explaining!

Best regards,
Pankaj


  reply	other threads:[~2021-07-12 10:18 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12  8:39 David Hildenbrand
2021-07-12  9:58 ` Pankaj Gupta
2021-07-12 10:03   ` David Hildenbrand
2021-07-12 10:17     ` Pankaj Gupta [this message]
2021-07-25 20:15   ` Alejandro Colomar (man-pages)
2021-07-26  7:11     ` David Hildenbrand
2021-07-12 11:05 ` Pankaj Gupta

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