measuring the flash usage
Folkert van Heusden
folkert.van.heusden at gmail.com
Wed Sep 21 02:47:41 EDT 2011
>> For an embedded system I'm working on I'd like to monitor the health
>> of the flash memory.
>> On regular Linux systems one can look at /proc/diskstats to see how
>> often the system writes to a disk. It seems though that (at least
>> kernel 2.6.19) for flash these counters are not updated.
> I don't have much experience with the /proc/diskstats but for me, it
> at least lists the mtdblockX devices I have on my system (which I
> don't use). If you use those (for instance, for JFFS2?), then I would
> imagine that Linux will track stats as with other block devices. Is
> this not your experience?
They're there, they just won't get updated.
> Generally, MTD is pretty good at printing important messages, which
> should get logged by your system. Also, bitflips/ECC errors can be
> tracked with ioctl(ECCGETSTATS). This info is retrieved, for example,
> by nanddump.
Are these values retained accross power off/reboots?
And will this work for NOR flash?
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