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charset="utf-8" Jens has already completed the development of uncached buffered I/O in git [1], and in f2fs, uncached buffered I/O read can be enabled simply by setting the FOP_DONTCACHE flag in f2fs_file_operations. I have been testing a use case locally, which aligns with Jens' test case [2]. In the read scenario, using uncached buffer I/O results in more stable read performance and a lower load on the background memory reclaim thread (kswapd). So let's enable uncached buffer I/O reads on F2FS. Read test data without using uncached buffer I/O: reading bs 32768, uncached 0 1s: 1856MB/sec, MB=3D1856 2s: 1907MB/sec, MB=3D3763 3s: 1830MB/sec, MB=3D5594 4s: 1745MB/sec, MB=3D7333 5s: 1829MB/sec, MB=3D9162 6s: 1903MB/sec, MB=3D11075 7s: 1878MB/sec, MB=3D12942 8s: 1763MB/sec, MB=3D14718 9s: 1845MB/sec, MB=3D16549 10s: 1915MB/sec, MB=3D18481 11s: 1831MB/sec, MB=3D20295 12s: 1750MB/sec, MB=3D22066 13s: 1787MB/sec, MB=3D23832 14s: 1913MB/sec, MB=3D25769 15s: 1898MB/sec, MB=3D27668 16s: 1795MB/sec, MB=3D29436 17s: 1812MB/sec, MB=3D31248 18s: 1890MB/sec, MB=3D33139 19s: 1880MB/sec, MB=3D35020 20s: 1754MB/sec, MB=3D36810 08:36:26 UID PID %usr %system %guest %wait %CPU CPU = Command 08:36:27 0 93 0.00 0.00 0.00 0.00 0.00 7 = kswapd0 08:36:28 0 93 0.00 0.00 0.00 0.00 0.00 7 = kswapd0 08:36:29 0 93 0.00 0.00 0.00 0.00 0.00 7 = kswapd0 08:36:30 0 93 0.00 56.00 0.00 0.00 56.00 7 = kswapd0 08:36:31 0 93 0.00 73.00 0.00 0.00 73.00 7 = kswapd0 08:36:32 0 93 0.00 83.00 0.00 0.00 83.00 7 = kswapd0 08:36:33 0 93 0.00 75.00 0.00 0.00 75.00 7 = kswapd0 08:36:34 0 93 0.00 81.00 0.00 0.00 81.00 7 = kswapd0 08:36:35 0 93 0.00 54.00 0.00 1.00 54.00 2 = kswapd0 08:36:36 0 93 0.00 61.00 0.00 0.00 61.00 0 = kswapd0 08:36:37 0 93 0.00 68.00 0.00 0.00 68.00 7 = kswapd0 08:36:38 0 93 0.00 53.00 0.00 0.00 53.00 2 = kswapd0 08:36:39 0 93 0.00 82.00 0.00 0.00 82.00 7 = kswapd0 08:36:40 0 93 0.00 77.00 0.00 0.00 77.00 1 = kswapd0 08:36:41 0 93 0.00 74.00 0.00 1.00 74.00 7 = kswapd0 08:36:42 0 93 0.00 71.00 0.00 0.00 71.00 7 = kswapd0 08:36:43 0 93 0.00 78.00 0.00 0.00 78.00 7 = kswapd0 08:36:44 0 93 0.00 85.00 0.00 0.00 85.00 7 = kswapd0 08:36:45 0 93 0.00 83.00 0.00 0.00 83.00 7 = kswapd0 08:36:46 0 93 0.00 70.00 0.00 0.00 70.00 7 = kswapd0 08:36:47 0 93 0.00 78.00 0.00 1.00 78.00 2 = kswapd0 08:36:48 0 93 0.00 81.00 0.00 0.00 81.00 3 = kswapd0 08:36:49 0 93 0.00 54.00 0.00 0.00 54.00 7 = kswapd0 08:36:50 0 93 0.00 76.00 0.00 0.00 76.00 1 = kswapd0 08:36:51 0 93 0.00 75.00 0.00 0.00 75.00 0 = kswapd0 08:36:52 0 93 0.00 73.00 0.00 0.00 73.00 7 = kswapd0 08:36:53 0 93 0.00 61.00 0.00 1.00 61.00 7 = kswapd0 08:36:54 0 93 0.00 80.00 0.00 0.00 80.00 7 = kswapd0 08:36:55 0 93 0.00 64.00 0.00 0.00 64.00 7 = kswapd0 08:36:56 0 93 0.00 56.00 0.00 0.00 56.00 7 = kswapd0 08:36:57 0 93 0.00 26.00 0.00 0.00 26.00 2 = kswapd0 08:36:58 0 93 0.00 24.00 0.00 1.00 24.00 3 = kswapd0 08:36:59 0 93 0.00 22.00 0.00 1.00 22.00 3 = kswapd0 08:37:00 0 93 0.00 15.84 0.00 0.00 15.84 3 = kswapd0 08:37:01 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 08:37:02 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 Read test data after using uncached buffer I/O: reading bs 32768, uncached 1 1s: 1863MB/sec, MB=3D1863 2s: 1903MB/sec, MB=3D3766 3s: 1860MB/sec, MB=3D5627 4s: 1864MB/sec, MB=3D7491 5s: 1860MB/sec, MB=3D9352 6s: 1854MB/sec, MB=3D11206 7s: 1874MB/sec, MB=3D13081 8s: 1874MB/sec, MB=3D14943 9s: 1840MB/sec, MB=3D16798 10s: 1849MB/sec, MB=3D18647 11s: 1863MB/sec, MB=3D20511 12s: 1798MB/sec, MB=3D22310 13s: 1897MB/sec, MB=3D24207 14s: 1817MB/sec, MB=3D26025 15s: 1893MB/sec, MB=3D27918 16s: 1917MB/sec, MB=3D29836 17s: 1863MB/sec, MB=3D31699 18s: 1904MB/sec, MB=3D33604 19s: 1894MB/sec, MB=3D35499 20s: 1907MB/sec, MB=3D37407 08:38:00 UID PID %usr %system %guest %wait %CPU CPU = Command 08:38:01 0 93 0.00 0.00 0.00 0.00 0.00 4 = kswapd0 08:38:02 0 93 0.00 0.00 0.00 0.00 0.00 4 = kswapd0 08:38:03 0 93 0.00 0.00 0.00 0.00 0.00 4 = kswapd0 08:38:04 0 93 0.00 0.00 0.00 0.00 0.00 4 = kswapd0 08:38:05 0 93 0.00 0.00 0.00 0.00 0.00 4 = kswapd0 08:38:06 0 93 0.00 1.00 0.00 1.00 1.00 0 = kswapd0 08:38:07 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:08 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:09 0 93 0.00 1.00 0.00 0.00 1.00 1 = kswapd0 08:38:10 0 93 0.00 0.00 0.00 0.00 0.00 1 = kswapd0 08:38:11 0 93 0.00 0.00 0.00 0.00 0.00 1 = kswapd0 08:38:12 0 93 0.00 0.00 0.00 0.00 0.00 1 = kswapd0 08:38:13 0 93 0.00 0.00 0.00 0.00 0.00 1 = kswapd0 08:38:14 0 93 0.00 0.00 0.00 0.00 0.00 1 = kswapd0 08:38:15 0 93 0.00 3.00 0.00 0.00 3.00 0 = kswapd0 08:38:16 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:17 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:18 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:19 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:20 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:21 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:22 0 93 0.00 0.00 0.00 0.00 0.00 0 = kswapd0 08:38:23 0 93 0.00 3.00 0.00 0.00 3.00 4 = kswapd0 08:38:24 0 93 0.00 0.00 0.00 0.00 0.00 4 = kswapd0 08:38:25 0 93 0.00 0.00 0.00 0.00 0.00 4 = kswapd0 08:38:26 0 93 0.00 4.00 0.00 0.00 4.00 3 = kswapd0 08:38:27 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 08:38:28 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 08:38:29 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 08:38:30 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 08:38:31 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 08:38:32 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 08:38:33 0 93 0.00 0.00 0.00 0.00 0.00 3 = kswapd0 [1] https://lore.kernel.org/all/20241220154831.1086649-10-axboe@kernel.dk/T/#m5= 8520a94b46f543d82db3711453dfc7bb594b2b0 [2] https://pastebin.com/u8eCBzB5 Signed-off-by: Qi Han Reviewed-by: Chao Yu --- fs/f2fs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 696131e655ed..d8da1fc2febf 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -5425,5 +5425,5 @@ const struct file_operations f2fs_file_operations =3D= { .splice_read =3D f2fs_file_splice_read, .splice_write =3D iter_file_splice_write, .fadvise =3D f2fs_file_fadvise, - .fop_flags =3D FOP_BUFFER_RASYNC, + .fop_flags =3D FOP_BUFFER_RASYNC | FOP_DONTCACHE, }; --=20 2.48.1