I am using the current mount options:
UUID=46fc675c-f196-4be2-bf4d-461d473de6b1 / ext4
errors=remount-ro,user_xattr 0 1
And the dmesg messages I get are:
[ 2.908858] EXT4-fs (sda5): mounted filesystem with ordered data
mode. Opts: (null)
[ 14.167465] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro,user_xattr
[ 15.512701] EXT4-fs (sda5): re-mounted. Opts:
errors=remount-ro,user_xattr,commit=0
[ 20.801609] EXT4-fs (sda5): re-mounted. Opts:
errors=remount-ro,user_xattr,commit=0
How can I give you more information?
Thanks,
Javi
On Wed, Feb 16, 2011 at 2:12 AM, Yongqiang Yang <xiaoqiangnk@xxxxxxxxx> wrote:
> WasÂext4 mounted with dealloc?
>
> On Mon, Feb 7, 2011 at 3:41 PM, Javi <javier.cabezas@xxxxxxxxx> wrote:
>>
>> I am developing a software based DSM. In order to avoid concurrent
>> updates on a memory page that is being updated by the runtime I am
>> using a shadow mapping to perform the updates. This mappings are
>> created by opening a file, unlinking it and mmap-ing on the file
>> descriptor. Everything is working but I am experiencing heavy disk I/O
>> during execution on a machine with a single ext4 file system. Other
>> machines that use ext3 partitions don't exhibit this behavior (there
>> is no disk I/O at all). This machine is using the kernel version
>> 2.6.35-25-generic.
>>
>> The exact steps performed to create the mappings are:
>>
>> Â Â// Create the file
>> Â Âsnprintf(tmp, FILENAME_MAX, "/tmp/testXXXXXX");
>> Â Âint fd = mkstemp(tmp);
>> Â Âif(fd < 0) return NULL;
>> Â Âunlink(tmp);
>>
>> Â Âif(ftruncate(fd, count) < 0) {
>> Â Â Â Âclose(fd);
>> Â Â Â Âreturn NULL;
>> Â Â}
>> Â Â...
>>
>> Â Â// Create a mapping
>> Â Âaddr = mmap(NULL, count, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
>>
>>
>> Does ext4 write to mmap'ed files although they don't have a name in
>> the file system? Am I doing anything wrong?
>>
>> Thanks,
>> ÂJavi
>> --
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>
>
>
> --
> Best Wishes
> Yongqiang Yang
>
>
--
Javi
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