From: Minchan Kim <minchan@kernel.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team <kernel-team@lge.com>, Christoph Hellwig <hch@lst.de>, Minchan Kim <minchan@kernel.org> Subject: [PATCH v2 0/4] skip swapcache for super fast device Date: Wed, 20 Sep 2017 14:43:21 +0900 [thread overview] Message-ID: <1505886205-9671-1-git-send-email-minchan@kernel.org> (raw) With fast swap storage, platform want to use swap more aggressively and swap-in is crucial to application latency. The rw_page based synchronous devices like zram, pmem and btt are such fast storage. When I profile swapin performance with zram lz4 decompress test, S/W overhead is more than 70%. Maybe, it would be bigger in nvdimm. This patch aims for reducing swap-in latency via skipping swapcache if swap device is synchronous device like rw_page based device. It enhances 45% my swapin test(5G sequential swapin, no readahead, from 2.41sec to 1.64sec). Andrew, [1] is zram specific patch so could be applied separately but this patch is based on that so I include it in this series. * From v1 * style fix * a bug fix * drop page-cluster based readahead off * This regression could be solved by other patch from Huang. http://lkml.kernel.org/r/87tw04in60.fsf@yhuang-dev.intel.com Minchan Kim (4): [1] zram: set BDI_CAP_STABLE_WRITES once [2] bdi: introduce BDI_CAP_SYNCHRONOUS_IO [3] mm:swap: introduce SWP_SYNCHRONOUS_IO [4] mm:swap: skip swapcache for swapin of synchronous device drivers/block/brd.c | 2 ++ drivers/block/zram/zram_drv.c | 16 +++++-------- drivers/nvdimm/btt.c | 3 +++ drivers/nvdimm/pmem.c | 2 ++ include/linux/backing-dev.h | 8 +++++++ include/linux/swap.h | 14 +++++++++++- mm/memory.c | 52 ++++++++++++++++++++++++++++++------------- mm/page_io.c | 6 ++--- mm/swapfile.c | 14 ++++++++---- 9 files changed, 83 insertions(+), 34 deletions(-) -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Minchan Kim <minchan@kernel.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team <kernel-team@lge.com>, Christoph Hellwig <hch@lst.de>, Minchan Kim <minchan@kernel.org> Subject: [PATCH v2 0/4] skip swapcache for super fast device Date: Wed, 20 Sep 2017 14:43:21 +0900 [thread overview] Message-ID: <1505886205-9671-1-git-send-email-minchan@kernel.org> (raw) With fast swap storage, platform want to use swap more aggressively and swap-in is crucial to application latency. The rw_page based synchronous devices like zram, pmem and btt are such fast storage. When I profile swapin performance with zram lz4 decompress test, S/W overhead is more than 70%. Maybe, it would be bigger in nvdimm. This patch aims for reducing swap-in latency via skipping swapcache if swap device is synchronous device like rw_page based device. It enhances 45% my swapin test(5G sequential swapin, no readahead, from 2.41sec to 1.64sec). Andrew, [1] is zram specific patch so could be applied separately but this patch is based on that so I include it in this series. * From v1 * style fix * a bug fix * drop page-cluster based readahead off * This regression could be solved by other patch from Huang. http://lkml.kernel.org/r/87tw04in60.fsf@yhuang-dev.intel.com Minchan Kim (4): [1] zram: set BDI_CAP_STABLE_WRITES once [2] bdi: introduce BDI_CAP_SYNCHRONOUS_IO [3] mm:swap: introduce SWP_SYNCHRONOUS_IO [4] mm:swap: skip swapcache for swapin of synchronous device drivers/block/brd.c | 2 ++ drivers/block/zram/zram_drv.c | 16 +++++-------- drivers/nvdimm/btt.c | 3 +++ drivers/nvdimm/pmem.c | 2 ++ include/linux/backing-dev.h | 8 +++++++ include/linux/swap.h | 14 +++++++++++- mm/memory.c | 52 ++++++++++++++++++++++++++++++------------- mm/page_io.c | 6 ++--- mm/swapfile.c | 14 ++++++++---- 9 files changed, 83 insertions(+), 34 deletions(-) -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2017-09-20 5:43 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-09-20 5:43 Minchan Kim [this message] 2017-09-20 5:43 ` [PATCH v2 0/4] skip swapcache for super fast device Minchan Kim 2017-09-20 5:43 ` [PATCH v2 1/4] zram: set BDI_CAP_STABLE_WRITES once Minchan Kim 2017-09-20 5:43 ` Minchan Kim 2017-09-20 5:43 ` [PATCH v2 2/4] bdi: introduce BDI_CAP_SYNCHRONOUS_IO Minchan Kim 2017-09-20 5:43 ` Minchan Kim 2017-09-20 5:43 ` [PATCH v2 3/4] mm:swap: introduce SWP_SYNCHRONOUS_IO Minchan Kim 2017-09-20 5:43 ` Minchan Kim 2017-09-20 5:43 ` [PATCH v2 4/4] mm:swap: skip swapcache for swapin of synchronous device Minchan Kim 2017-09-20 5:43 ` Minchan Kim 2017-09-29 8:51 ` huang ying 2017-09-29 8:51 ` huang ying 2017-10-09 1:26 ` huang ying 2017-10-09 1:26 ` huang ying 2017-10-10 0:34 ` Minchan Kim 2017-10-10 0:34 ` Minchan Kim 2017-10-10 1:10 ` Huang, Ying 2017-10-10 1:10 ` Huang, Ying -- strict thread matches above, loose matches on Subject: below -- 2017-09-19 7:09 [PATCH v2 0/4] skip swapcache for super fast device Minchan Kim 2017-09-19 7:09 ` Minchan Kim
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