From: heechul@illinois.edu (heechul Yun)
To: linux-arm-kernel@lists.infradead.org
Subject: Unnecessary cache-line flush on page table updates ?
Date: Fri, 1 Jul 2011 00:04:42 -0700 [thread overview]
Message-ID: <BANLkTin7aJXjpEH_WzJi5zaAtH8kFcTZeg@mail.gmail.com> (raw)
Catalin,
Based on TRM of Cortex A9, the MMU reads page table entries from L1-D
cache not from memory. Then I think we do not need to flush the cache
line in the following code because MMU will always see up-to-date view
of page table in both UP and SMP systems.
linux/arch/arm/mm/proc-v7.S
ENTRY(cpu_v7_set_pte_ext)
...
mcr p15, 0, r0, c7, c10, 1 @ flush_pte from
D-cache // why we need this in A9?
?
If this is a necessary one, could you please explain the reason? Thanks.
next reply other threads:[~2011-07-01 7:04 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-01 7:04 heechul Yun [this message]
2011-07-01 10:10 ` Unnecessary cache-line flush on page table updates ? Catalin Marinas
2011-07-01 21:42 ` heechul Yun
2011-07-04 9:45 ` Catalin Marinas
2011-07-04 10:02 ` Russell King - ARM Linux
2011-07-04 10:43 ` Catalin Marinas
2011-07-04 11:13 ` Russell King - ARM Linux
2011-07-04 15:58 ` Catalin Marinas
2011-07-04 19:58 ` Russell King - ARM Linux
2011-07-04 23:20 ` Russell King - ARM Linux
2011-07-06 16:05 ` Catalin Marinas
2011-07-06 18:08 ` Russell King - ARM Linux
2011-07-11 16:49 ` Catalin Marinas
2011-07-11 17:01 ` Russell King - ARM Linux
2011-07-12 13:09 ` Catalin Marinas
2011-07-15 16:24 ` Russell King - ARM Linux
2011-07-05 10:07 ` Catalin Marinas
2011-07-04 21:55 ` Russell King - ARM Linux
2011-07-05 9:26 ` Catalin Marinas
2011-07-05 9:46 ` Russell King - ARM Linux
2011-07-06 15:52 ` Catalin Marinas
2011-07-06 15:55 ` Russell King - ARM Linux
2011-07-06 16:15 ` Catalin Marinas
2011-07-05 10:48 ` Russell King - ARM Linux
2011-07-05 13:54 ` Catalin Marinas
2011-07-05 14:15 ` Russell King - ARM Linux
2011-07-05 14:40 ` Catalin Marinas
2011-07-04 13:05 ` Russell King - ARM Linux
2011-07-04 13:15 ` Catalin Marinas
2011-07-04 14:59 ` heechul Yun
2011-07-04 21:24 ` heechul Yun
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