On Sun, 10 Apr 2016, coypu@xxxxxxx wrote: > Hello linux janitors, > > from kmalloc man page: > > GFP_ATOMIC - Allocation will not sleep. May use emergency pools. For > example, use this inside interrupt handlers. > GFP_NOWAIT - Allocation will not sleep. > > grepping linux kernel tree: > > [0:/usr/linux-src> ]$ grep -R GFP_ATOMIC . |wc -l > 4452 > [0:/usr/linux-src> ]$ grep -R GFP_NOWAIT . |wc -l > 220 > > (alternative flags and some accounting: > total k.*alloc calls: 34320 > GFP_KERNEL appearances: 23819 > GDP_ATOMIC appearances: 4452 > GFP_NOWAIT appearances: 220 > > unaccounted: 5829) > > GFP_ATOMIC is meant for interrupt handlers and emergency pool. > Widespread misuse renders the emergency pool useless. > > I believe the vast majority of such uses can be converted to GFP_NOWAIT. > Even valid uses of GFP_ATOMIC are likely rendered useless by this > widespread misuse. > > You may wish to replace such calls. How does one know which need the emergency pool? julia -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
