From: Toshi Kani <toshi.kani@hpe.com>
To: dan.j.williams@intel.com
Cc: kirill.shutemov@linux.intel.com, willy@linux.intel.com,
ross.zwisler@linux.intel.com, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] dax: Split pmd map when fallback on COW
Date: Mon, 23 Nov 2015 15:58:46 -0700 [thread overview]
Message-ID: <1448319526.19320.58.camel@hpe.com> (raw)
In-Reply-To: <1448309120-20911-1-git-send-email-toshi.kani@hpe.com>
On Mon, 2015-11-23 at 13:05 -0700, Toshi Kani wrote:
> An infinite loop of PMD faults was observed when attempted to
> mlock() a private read-only PMD mmap'd range of a DAX file.
Typo: the above description should be (remove "read-only"):
An infinite loop of PMD faults was observed when attempted to mlock() a private
PMD mmap'd range of a DAX file.
-Toshi
> __dax_pmd_fault() simply returns with VM_FAULT_FALLBACK when
> falling back to PTE on COW. However, __handle_mm_fault()
> returns without falling back to handle_pte_fault() because
> a PMD map is present in this case.
>
> Change __dax_pmd_fault() to split the PMD map, if present,
> before returning with VM_FAULT_FALLBACK.
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next prev parent reply other threads:[~2015-11-23 23:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-23 20:05 Toshi Kani
2015-11-23 20:45 ` Dan Williams
2015-11-23 20:45 ` Toshi Kani
2015-11-23 20:56 ` Dan Williams
2015-11-23 21:04 ` Toshi Kani
2015-11-23 22:58 ` Toshi Kani [this message]
2015-11-24 17:08 ` Dan Williams
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