Messages in this thread | | | Subject | Re: [PATCH v2] f2fs: change write_hint for hot/warm nodes | From | Chao Yu <> | Date | Tue, 3 Nov 2020 17:01:36 +0800 |
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On 2020/11/3 16:38, Daejun Park wrote: > In the fs-based mode of F2FS, the mapping of hot/warm node to > WRITE_LIFE_NOT_SET should be changed to WRITE_LIFE_SHORT. > > As a result of analyzing the write pattern of f2fs using real workload, > hot/warm nodes have high update ratio close to hot data.[*] > However, F2FS passes write hints for hot/warm nodes as WRITE_LIFE_NOT_SET. > > Furthermore, WRITE_LIFE_NOT_SET is a default value of write hint when it is > not provided from the file system. > In storage, write_hint is used to distinguish streams (e.g. NVMe). > So, the hot/warm node of F2FS is not distinguished from other write_hints, > which can make the wrong stream seperation. > > * Liang, Yu, et al. "An empirical study of F2FS on mobile devices." 2017 > IEEE 23rd International Conference on Embedded and Real-Time Computing > Systems and Applications (RTCSA). > > Signed-off-by: Daejun Park <daejun7.park@samsung.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Thanks,
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