From: Andrew Morton <akpm@osdl.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: roland@redhat.com, mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] report user-readable fixmap area in /proc/PID/maps
Date: Sun, 12 Oct 2003 19:17:06 -0700 [thread overview]
Message-ID: <20031012191706.02c22aab.akpm@osdl.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0310121845100.12190-100000@home.osdl.org>
Linus Torvalds <torvalds@osdl.org> wrote:
>
> If you really want /proc/PID/maps to look right, add a new vm_area_struct,
> see if you can allocate it as part of the "struct mm_struct" so that we
> don't get yet another (unnecessary) allocation on fork time.
It could be done "on demand". So get_user_pages() and the /proc code will
call the new add_fixmap_vma() on entry. Hence the additional overhead is
only incurred when /proc/pid/maps is accessed, or get_user_pages() is
called.
It'll need a new flag in mm_struct. mm_struct.swap_address can be
salvaged: it is no longer used.
next prev parent reply other threads:[~2003-10-13 2:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-07 8:54 Roland McGrath
2003-10-13 1:17 ` Andrew Morton
2003-10-13 1:35 ` Roland McGrath
2003-10-13 1:49 ` Linus Torvalds
2003-10-13 2:08 ` William Lee Irwin III
2003-10-13 2:17 ` Andrew Morton [this message]
2003-11-26 6:49 David Mosberger
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