From: Linus Torvalds <torvalds@linux-foundation.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>,
Mike Travis <travis@sgi.com>,
Christoph Lameter <cl@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>,
Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
Izik Eidus <ieidus@redhat.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Nick Piggin <npiggin@suse.de>, Mel Gorman <mel@csn.ul.ie>,
Andi Kleen <andi@firstfloor.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Chris Wright <chrisw@sous-sol.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Stephen C. Tweedie" <sct@redhat.com>
Subject: Re: Swap on flash SSDs
Date: Fri, 18 Dec 2009 12:13:22 -0800 (PST) [thread overview]
Message-ID: <alpine.LFD.2.00.0912181211320.3712@localhost.localdomain> (raw)
In-Reply-To: <20091218193911.GA6153@elte.hu>
On Fri, 18 Dec 2009, Ingo Molnar wrote:
>
> And even when a cell does go bad and all the spares are gone, the failure mode
> is not catastrophic like with a hard disk, but that particular cell goes
> read-only and you can still recover the info and use the remaining cells.
Maybe. The real issue is the flash firmware. You want to bet it hasn't
been tested very well against wear-related failures in real life?
Once the flash firmware gets confused due to some bug, the end result is
usually a totally dead device.
So failure modes can easily be pretty damn catastrophic. Not that that is
in any way specific to flash (the failures I've seen on rotational disks
have been generally catastrophic too - people who malign flashes for some
reason don't seem to admit that rotational media tends to have all the
same problems and then some).
Linus
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next prev parent reply other threads:[~2009-12-18 20:14 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-17 19:00 [PATCH 00 of 28] Transparent Hugepage support #2 Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 01 of 28] compound_lock Andrea Arcangeli
2009-12-17 19:46 ` Christoph Lameter
2009-12-18 14:27 ` Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 02 of 28] alter compound get_page/put_page Andrea Arcangeli
2009-12-17 19:50 ` Christoph Lameter
2009-12-18 14:30 ` Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 03 of 28] clear compound mapping Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 04 of 28] add native_set_pmd_at Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 05 of 28] add pmd paravirt ops Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 06 of 28] no paravirt version of pmd ops Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 07 of 28] export maybe_mkwrite Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 08 of 28] comment reminder in destroy_compound_page Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 09 of 28] config_transparent_hugepage Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 10 of 28] add pmd mangling functions to x86 Andrea Arcangeli
2009-12-18 18:56 ` Mel Gorman
2009-12-19 15:27 ` Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 11 of 28] add pmd mangling generic functions Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 12 of 28] special pmd_trans_* functions Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 13 of 28] bail out gup_fast on freezed pmd Andrea Arcangeli
2009-12-18 18:59 ` Mel Gorman
2009-12-19 15:48 ` Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 14 of 28] pte alloc trans splitting Andrea Arcangeli
2009-12-18 19:03 ` Mel Gorman
2009-12-19 15:59 ` Andrea Arcangeli
2009-12-21 19:57 ` Mel Gorman
2009-12-17 19:00 ` [PATCH 15 of 28] add pmd mmu_notifier helpers Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 16 of 28] clear page compound Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 17 of 28] add pmd_huge_pte to mm_struct Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 18 of 28] ensure mapcount is taken on head pages Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 19 of 28] split_huge_page_mm/vma Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 20 of 28] split_huge_page paging Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 21 of 28] pmd_trans_huge migrate bugcheck Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 22 of 28] clear_huge_page fix Andrea Arcangeli
2009-12-18 19:16 ` Mel Gorman
2009-12-17 19:00 ` [PATCH 23 of 28] clear_copy_huge_page Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 24 of 28] kvm mmu transparent hugepage support Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 25 of 28] transparent hugepage core Andrea Arcangeli
2009-12-18 20:03 ` Mel Gorman
2009-12-19 16:41 ` Andrea Arcangeli
2009-12-21 20:31 ` Mel Gorman
2009-12-23 0:06 ` Andrea Arcangeli
2009-12-23 6:09 ` Paul Mundt
2010-01-03 18:38 ` Mel Gorman
2010-01-04 15:49 ` Andrea Arcangeli
2010-01-04 16:58 ` Christoph Lameter
2010-01-04 6:16 ` Daisuke Nishimura
2010-01-04 16:04 ` Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 26 of 28] madvise(MADV_HUGEPAGE) Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 27 of 28] memcg compound Andrea Arcangeli
2009-12-18 1:27 ` KAMEZAWA Hiroyuki
2009-12-18 16:02 ` Andrea Arcangeli
2009-12-17 19:00 ` [PATCH 28 of 28] memcg huge memory Andrea Arcangeli
2009-12-18 1:33 ` KAMEZAWA Hiroyuki
2009-12-18 16:04 ` Andrea Arcangeli
2009-12-18 23:06 ` KAMEZAWA Hiroyuki
2009-12-20 18:39 ` Andrea Arcangeli
2009-12-21 0:26 ` KAMEZAWA Hiroyuki
2009-12-21 1:24 ` Daisuke Nishimura
2009-12-21 3:52 ` KAMEZAWA Hiroyuki
2009-12-21 4:33 ` Daisuke Nishimura
2009-12-25 4:17 ` Daisuke Nishimura
2009-12-25 4:37 ` KAMEZAWA Hiroyuki
2009-12-24 10:00 ` Balbir Singh
2009-12-24 11:40 ` Andrea Arcangeli
2009-12-24 12:07 ` Balbir Singh
2009-12-17 19:54 ` [PATCH 00 of 28] Transparent Hugepage support #2 Christoph Lameter
2009-12-17 19:58 ` Rik van Riel
2009-12-17 20:09 ` Christoph Lameter
2009-12-18 5:12 ` Ingo Molnar
2009-12-18 6:18 ` KOSAKI Motohiro
2009-12-18 18:28 ` Christoph Lameter
2009-12-18 18:41 ` Dave Hansen
2009-12-18 19:17 ` Mike Travis
2009-12-18 19:28 ` Swap on flash SSDs Dave Hansen
2009-12-18 19:38 ` Andi Kleen
2009-12-18 19:39 ` Ingo Molnar
2009-12-18 20:13 ` Linus Torvalds [this message]
2009-12-18 20:31 ` Ingo Molnar
2009-12-19 18:38 ` Jörn Engel
2009-12-18 14:05 ` [PATCH 00 of 28] Transparent Hugepage support #2 Andrea Arcangeli
2009-12-18 18:33 ` Christoph Lameter
2009-12-19 15:09 ` Andrea Arcangeli
2009-12-17 20:47 ` Mike Travis
2009-12-18 3:28 ` Rik van Riel
2009-12-18 14:12 ` Andrea Arcangeli
2009-12-18 12:52 ` Avi Kivity
2009-12-18 18:47 ` Dave Hansen
2009-12-19 15:20 ` Andrea Arcangeli
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