On Dec 17, 2007, at 1:51 AM, Joel Stanley wrote: > JFFS2 has done an excellent job, at least on my xos, of keeping > filesystem integrity after sudden power-offs.
Write-back caching does not adversely affect filesystem *integrity*. It makes a tradeoff by reducing flash write/erase frequency and increasing apparent filesystem performance at the cost of more recently-written data potentially being lost in case of power failure. This tradeoff is eminently reasonable as a default policy. Remember that programs can still call fsync to force a flush to flash, and that more context-sensitive policy can be implemented by more context-aware elements of the stack. OHM could, for instance, remount the filesystem synchronously when battery charge goes below a threshold, or it can simply twiddle the /proc twaddle that twuddles the writeback timer twoddle. -- Ivan Krstić <[EMAIL PROTECTED]> | http://radian.org _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
