Re: VFS hot tracking: How to calculate data temperature?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Nov 02, 2012 at 04:41:09PM +0800, Zheng Liu wrote:
> On Fri, Nov 02, 2012 at 02:38:29PM +0800, Zhi Yong Wu wrote:
> > Here also has another question.
> > 
> > How to save the file temperature among the umount to be able to
> > preserve the file tempreture after reboot?
> > 
> > This above is the requirement from DB product.
> > I thought that we can save file temperature in its inode struct, that
> > is, add one new field in struct inode, then this info will be written
> > to disk with inode.
> > 
> > Any comments or ideas are appreciated, thanks.
> 
> Hi Zhiyong,
> 
> I think that we might define a callback function.  If a filesystem wants
> to save these data, it can implement a function to save them.  The
> filesystem can decide whether adding it or not by themselves.
> 
> BTW, actually I don't really care about how to save these data because I
> only want to observe which file is accessed in real time, which is very
> useful for me to track a problem in our product system.

<shrug> I _think_ the vfs quota code simply asks the filesystem for a special
inode where it save the quota data in whatever (FS-agnostic) format it wants.
Have you considered something like that?

(Or, maybe everyone secretly hates doing that?  Secret files, yaaay...)

--D
> 
> Regards,
> Zheng
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux