Re: [PATCH v1 0/5] stop anon reclaim when zram is full
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 majord...@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: mailto:"d...@kvack.org;> em...@kvack.org -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v1 0/5] stop anon reclaim when zram is full
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 majord...@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: a href=mailto:d...@kvack.org; em...@kvack.org /a -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH v1 0/5] stop anon reclaim when zram is full
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 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH v1 0/5] stop anon reclaim when zram is full
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 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 from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
