On Mon, Sep 15, 2014 at 11:49:28PM +0900, Sergey Senozhatsky wrote: > `notify_free' device attribute accounts the number of slot free notifications > and internally represents the number of zram_free_page() calls. Slot free > notifications are sent only when device is used as a swap device, hence > `notify_free' is used only for swap devices. Since f4659d8e620d08 (zram: > support REQ_DISCARD) ZRAM handles yet another one free notification (also > via zram_free_page() call) -- REQ_DISCARD requests, which are sent by a > filesystem, whenever some data blocks are discarded. However, there is no > way to know the number of notifications in the latter case. > > Use `notify_free' to account the number of pages freed by zram_bio_discard() > and zram_slot_free_notify(). Depending on usage scenario `notify_free' > represents: > a) the number of pages freed because of slot free notifications, which is > equal to the number of swap_slot_free_notify() calls, so there is no > behaviour change > > b) the number of pages freed because of REQ_DISCARD notifications > > Signed-off-by: Sergey Senozhatsky <[email protected]> Acked-by: Minchan Kim <[email protected]>
Thanks a lot! -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
