From: Simon Jeons <simon.jeons@gmail.com>
To: Linux Memory Management List <linux-mm@kvack.org>
Cc: Rik van Riel <riel@redhat.com>,
Dave Hansen <dave.hansen@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>, Mel Gorman <mgorman@suse.de>
Subject: vmalloc fault
Date: Fri, 26 Apr 2013 17:55:42 +0800 [thread overview]
Message-ID: <517A4F1E.9070803@gmail.com> (raw)
Hi all,
1. Why vmalloc fault need sync user process page table with kernel page
table instead of using kernel page table directly?
2. Why do_swap_page doesn't set present flag?
3. When enable DEBUG_PAGEALLOC(catch use-after-free bug), if user
process alloc pages from zone_normal(which is direct mapping) when
fallback, this page which allocated for user process will set present
flag in related pte, correct? but why also set present flag for kernel
direct mapping? Does kernel have any requirement to access it?
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next reply other threads:[~2013-04-26 9:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-26 9:55 Simon Jeons [this message]
2013-04-26 10:04 ` vmalloc fault Rik van Riel
2013-04-26 10:17 ` Simon Jeons
2013-04-26 10:19 ` Rik van Riel
2013-04-26 10:27 ` Simon Jeons
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