Hello all, On Mon, Sep 22, 2014 at 09:03:06AM +0900, Minchan Kim wrote: > For zram-swap, there is size gap between virtual disksize > and available physical memory size for zram so that VM > can try to reclaim anonymous pages even though zram is full. > It makes system alomost hang(ie, unresponsible) easily in > my kernel build test(ie, 1G DRAM, CPU 12, 4G zram swap, > 50M zram limit). VM should have killed someone. > > This patch adds new hint SWAP_FULL so VM can ask fullness > to zram and if it founds zram is full, VM doesn't reclaim > anonymous pages until zram-swap gets new free space. > > With this patch, I see OOM when zram-swap is full instead of > hang with no response. > > Minchan Kim (5): > zram: generalize swap_slot_free_notify > mm: add full variable in swap_info_struct > mm: VM can be aware of zram fullness > zram: add swap full hint > zram: add fullness knob to control swap full I'm sorry for long delay for this patch althogh you guys gave great feedback to me. The reason I was hesitant about this patchset is that I want to avoid weird fullness knob which was introduced by zsmalloc's internal limit. So, before this feature, I hope we get zsmalloc's compaction firstly Then, I hope to remove fullness knob totally. Thanks. > > Documentation/ABI/testing/sysfs-block-zram | 10 +++ > Documentation/filesystems/Locking | 4 +- > drivers/block/zram/zram_drv.c | 114 +++++++++++++++++++++++++++-- > drivers/block/zram/zram_drv.h | 2 + > include/linux/blkdev.h | 8 +- > include/linux/swap.h | 1 + > mm/page_io.c | 6 +- > mm/swapfile.c | 77 ++++++++++++++----- > 8 files changed, 189 insertions(+), 33 deletions(-) > > -- > 2.0.0 > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> -- Kind regards, Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>