From: Andreas Hindborg <a.hindborg@xxxxxxxxxxx> Hi All! This is an early preview of a null block driver written in Rust. It is a follow up to my LSF topic proposal [1]. I send this series with intention of collecting feedback and comments at LSF/MM/BPF. The patches apply on top of the `rust-next` tree (rust-6.4 ea76e08f4d901a450619831a255e9e0a4c0ed162) [4]. A null block driver is a good opportunity to evaluate Rust bindings for the block layer. It is a small and simple driver and thus should be simple to reason about. Further, the null block driver is not usually deployed in production environments. Thus, it should be fairly straight forward to review, and any potential issues are not going to bring down any production workloads. Being small and simple, the null block driver is a good place to introduce the Linux kernel storage community to Rust. This will help prepare the community for future Rust projects and facilitate a better maintenance process for these projects. The statistics presented in my previous message [1] show that the C null block driver has had a significant amount of memory safety related problems in the past. 41% of fixes merged for the C null block driver are fixes for memory safety issues. This makes the null block driver a good candidate for rewriting in Rust. Patches in this series prefixed with capitalized RUST are code taken from the R4L `rust` tree [2]. This code is not yet in mainline Linux and has not yet been submitted as patches for inclusion in Linux. I am not the original author of these patches, except for small changes required to include them in this series. The driver performs similarly to the C driver for the implemented features, see table below [5]. In this table each cell shows the relative performance of the Rust driver to the C driver with the throughput of the C driver in parenthesis: `rel_read rel_write (read_miops write_miops)`. Ex: the Rust driver performs 4.74 percent better than the C driver for fio randread with 2 jobs at 16 KiB block size. Over the 432 benchmark configurations, the relative performance of the Rust driver to the C driver (in terms of IOPS) is between 6.8 and -11.8 percent with an average of 0.2 percent better for reads. For writes the span is 16.8 to -4.5 percent with an average of 0.9 percent better. For each measurement the drivers are loaded, a drive is configured with memory backing and a size of 4 GiB. C null_blk is configured to match the implemented modes of the Rust driver: `blocksize` is set to 4 KiB, `completion_nsec` to 0, `irqmode` to 0 (IRQ_NONE), `queue_mode` to 2 (MQ), `hw_queue_depth` to 256 and `memory_backed` to 1. For both the drivers, the queue scheduler is set to `none`. These measurements are made using 30 second runs of `fio` with the `PSYNC` IO engine with workers pinned to separate CPU cores. The measurements are done inside a virtual machine (qemu/kvm) on an Intel Alder Lake workstation (i5-12600). Given the relatively large spread in these numbers, it is possible that there is quite a bit of noise in the results. If anybody is able to dedicate some CPU time to run benchmarks in a more controlled and standardized environment, I would appreciate it. The feature list of the driver is relatively short for now: - `blk-mq` support - Direct completion of IO - Read and write requests - Optional memory backing Features available in the C null_blk driver that are currently not implemented in this work: - Bio-based submission - NUMA support - Block size configuration - Multiple devices - Dynamic device creation/destruction - Soft-IRQ and timer mode - Queue depth configuration - Queue count configuration - Discard operation support - Cache emulation - Bandwidth throttling - Per node hctx - IO scheduler configuration - Blocking submission mode - Shared tags configuration (for >1 device) - Zoned storage support - Bad block simulation - Poll queues The driver is implemented entirely in safe Rust, with all unsafe code fully contained in wrappers for C APIs. Patches 07/11 and 08/11 that enable the equivalent of the C `spin_lock_irqsave()` did appear on the Rust list [6,3] but was not applied to `rust-next` tree yet [4]. I am not the author of these patches, but I include them here for convenience. Please defer any discussion of these patches to their original posts. The null block driver is provided in patch 10/11. Patches 03/11 and 04/11 introduce Rust abstractions for the block C APIs required by the driver. [1] https://lore.kernel.org/all/87y1ofj5tt.fsf@xxxxxxxxxxxx/ [2] https://github.com/Rust-for-Linux/linux/tree/rust [3] https://lore.kernel.org/all/20230411054543.21278-7-wedsonaf@xxxxxxxxx/ [4] https://github.com/Rust-for-Linux/linux/tree/rust-next [6] https://lore.kernel.org/all/20230411054543.21278-6-wedsonaf@xxxxxxxxx/ [5]: +---------+-----------+-------------------------------+-----------------------------+-------------------------------+ | jobs/bs | workload | 1 | 2 | 3 | +---------+-----------+-------------------------------+-----------------------------+-------------------------------+ | 4k | randread | 1.54 0.00 (0.7,0.0) | 0.35 0.00 (1.3,0.0) | -0.52 0.00 (1.3,0.0) | | 8k | randread | 3.30 0.00 (0.57,0.0) | 6.79 0.00 (0.92,0.0) | 0.24 0.00 (0.97,0.0) | | 16k | randread | 0.89 0.00 (0.42,0.0) | 4.74 0.00 (0.64,0.0) | 3.98 0.00 (0.65,0.0) | | 32k | randread | 2.04 0.00 (0.27,0.0) | 3.26 0.00 (0.37,0.0) | 1.41 0.00 (0.37,0.0) | | 64k | randread | 1.35 0.00 (0.16,0.0) | 0.71 0.00 (0.21,0.0) | 0.66 0.00 (0.22,0.0) | | 128k | randread | 0.59 0.00 (0.09,0.0) | 0.13 0.00 (0.1,0.0) | -6.47 0.00 (0.11,0.0) | | 256k | randread | 0.13 0.00 (0.048,0.0) | 1.00 0.00 (0.055,0.0) | 0.03 0.00 (0.059,0.0) | | 512k | randread | 1.16 0.00 (0.023,0.0) | -1.82 0.00 (0.027,0.0) | -0.90 0.00 (0.028,0.0) | | 1024k | randread | 0.14 0.00 (0.011,0.0) | 0.58 0.00 (0.012,0.0) | -1.14 0.00 (0.013,0.0) | | 2048k | randread | 2.02 0.00 (0.005,0.0) | 0.13 0.00 (0.0062,0.0) | -0.37 0.00 (0.0062,0.0) | | 4096k | randread | 1.21 0.00 (0.0026,0.0) | -5.68 0.00 (0.0031,0.0) | -2.39 0.00 (0.0029,0.0) | | 8192k | randread | -1.02 0.00 (0.0013,0.0) | 0.66 0.00 (0.0013,0.0) | -1.72 0.00 (0.0013,0.0) | | 4k | randrw | 2.82 2.82 (0.25,0.25) | 2.94 2.94 (0.3,0.3) | 3.19 3.20 (0.34,0.34) | | 8k | randrw | 2.80 2.82 (0.21,0.21) | 2.32 2.32 (0.25,0.25) | 1.95 1.96 (0.28,0.28) | | 16k | randrw | 4.54 4.52 (0.16,0.16) | 2.29 2.29 (0.2,0.2) | 2.27 2.30 (0.21,0.21) | | 32k | randrw | 3.51 3.51 (0.11,0.11) | 2.43 2.40 (0.13,0.13) | 1.38 1.38 (0.14,0.14) | | 64k | randrw | 2.40 2.42 (0.069,0.069) | 1.98 1.99 (0.08,0.08) | 0.51 0.51 (0.082,0.082) | | 128k | randrw | 1.50 1.49 (0.039,0.039) | 1.28 1.27 (0.042,0.042) | 0.83 0.84 (0.043,0.043) | | 256k | randrw | 2.02 2.06 (0.021,0.021) | 0.92 0.91 (0.022,0.022) | 0.70 0.75 (0.022,0.022) | | 512k | randrw | 0.82 0.82 (0.011,0.011) | 0.69 0.70 (0.011,0.011) | 0.97 0.98 (0.011,0.011) | | 1024k | randrw | 3.78 3.84 (0.0046,0.0046) | 0.98 0.98 (0.0053,0.0053) | 1.30 1.29 (0.0054,0.0054) | | 2048k | randrw | 1.60 1.54 (0.0023,0.0023) | 1.76 1.69 (0.0026,0.0026) | 1.23 0.92 (0.0026,0.0026) | | 4096k | randrw | 1.18 1.10 (0.0011,0.0012) | 1.32 1.20 (0.0014,0.0014) | 1.49 1.41 (0.0013,0.0013) | | 8192k | randrw | -2.01 -1.89 (0.00057,0.00057) | 1.20 1.14 (0.00061,0.00061) | -0.74 -0.61 (0.0006,0.00062) | | 4k | randwrite | 0.00 2.48 (0.0,0.41) | 0.00 3.61 (0.0,0.39) | 0.00 3.93 (0.0,0.44) | | 8k | randwrite | 0.00 3.46 (0.0,0.35) | 0.00 1.90 (0.0,0.34) | 0.00 2.20 (0.0,0.37) | | 16k | randwrite | 0.00 3.01 (0.0,0.28) | 0.00 2.86 (0.0,0.27) | 0.00 2.25 (0.0,0.29) | | 32k | randwrite | 0.00 3.02 (0.0,0.19) | 0.00 2.68 (0.0,0.19) | 0.00 2.20 (0.0,0.21) | | 64k | randwrite | 0.00 3.39 (0.0,0.12) | 0.00 3.75 (0.0,0.12) | 0.00 -0.79 (0.0,0.14) | | 128k | randwrite | 0.00 3.81 (0.0,0.069) | 0.00 1.10 (0.0,0.072) | 0.00 5.48 (0.0,0.078) | | 256k | randwrite | 0.00 4.28 (0.0,0.038) | 0.00 1.27 (0.0,0.037) | 0.00 -0.10 (0.0,0.041) | | 512k | randwrite | 0.00 2.71 (0.0,0.019) | 0.00 0.46 (0.0,0.017) | 0.00 2.96 (0.0,0.019) | | 1024k | randwrite | 0.00 2.67 (0.0,0.0082) | 0.00 2.54 (0.0,0.0087) | 0.00 0.20 (0.0,0.0093) | | 2048k | randwrite | 0.00 2.40 (0.0,0.0041) | 0.00 1.90 (0.0,0.0041) | 0.00 3.44 (0.0,0.0043) | | 4096k | randwrite | 0.00 3.38 (0.0,0.002) | 0.00 1.69 (0.0,0.0025) | 0.00 6.00 (0.0,0.0025) | | 8192k | randwrite | 0.00 3.09 (0.0,0.00098) | 0.00 1.10 (0.0,0.0012) | 0.00 0.45 (0.0,0.0012) | | 4k | read | 1.26 0.00 (1.0,0.0) | 1.65 0.00 (2.0,0.0) | -9.94 0.00 (2.8,0.0) | | 8k | read | 1.86 0.00 (0.78,0.0) | 4.60 0.00 (1.5,0.0) | 0.47 0.00 (1.7,0.0) | | 16k | read | 1.13 0.00 (0.54,0.0) | 4.00 0.00 (0.95,0.0) | -10.28 0.00 (0.97,0.0) | | 32k | read | 0.64 0.00 (0.32,0.0) | 5.54 0.00 (0.46,0.0) | -0.67 0.00 (0.47,0.0) | | 64k | read | 0.29 0.00 (0.18,0.0) | -0.08 0.00 (0.25,0.0) | -0.82 0.00 (0.25,0.0) | | 128k | read | 0.11 0.00 (0.095,0.0) | 0.12 0.00 (0.11,0.0) | -4.99 0.00 (0.12,0.0) | | 256k | read | 1.66 0.00 (0.05,0.0) | -0.41 0.00 (0.058,0.0) | -0.30 0.00 (0.061,0.0) | | 512k | read | 1.06 0.00 (0.024,0.0) | -1.77 0.00 (0.029,0.0) | 0.81 0.00 (0.029,0.0) | | 1024k | read | 0.41 0.00 (0.011,0.0) | -2.28 0.00 (0.013,0.0) | -0.33 0.00 (0.013,0.0) | | 2048k | read | -1.18 0.00 (0.0053,0.0) | 1.41 0.00 (0.0063,0.0) | -0.86 0.00 (0.0063,0.0) | | 4096k | read | -0.54 0.00 (0.0027,0.0) | -11.77 0.00 (0.0031,0.0) | 0.02 0.00 (0.003,0.0) | | 8192k | read | -1.60 0.00 (0.0013,0.0) | -4.25 0.00 (0.0013,0.0) | -1.64 0.00 (0.0013,0.0) | | 4k | readwrite | 1.01 1.01 (0.34,0.34) | 1.00 1.00 (0.42,0.42) | 1.30 1.29 (0.45,0.44) | | 8k | readwrite | 1.54 1.54 (0.28,0.28) | 1.65 1.66 (0.32,0.32) | 1.18 1.18 (0.36,0.36) | | 16k | readwrite | 1.07 1.08 (0.2,0.2) | 2.82 2.81 (0.24,0.24) | 0.40 0.39 (0.26,0.26) | | 32k | readwrite | 0.56 0.56 (0.13,0.13) | -1.31 -1.30 (0.16,0.16) | 0.09 0.09 (0.16,0.16) | | 64k | readwrite | 1.82 1.83 (0.077,0.077) | -0.96 -0.96 (0.091,0.091) | -0.99 -0.97 (0.092,0.092) | | 128k | readwrite | 2.09 2.10 (0.041,0.041) | 1.07 1.06 (0.045,0.045) | 0.28 0.29 (0.045,0.045) | | 256k | readwrite | 2.06 2.05 (0.022,0.022) | 1.84 1.85 (0.023,0.023) | 0.66 0.59 (0.023,0.023) | | 512k | readwrite | 5.90 5.84 (0.01,0.01) | 1.20 1.17 (0.011,0.011) | 1.18 1.21 (0.011,0.011) | | 1024k | readwrite | 1.94 1.89 (0.0047,0.0047) | 2.43 2.48 (0.0053,0.0053) | 2.18 2.21 (0.0054,0.0054) | | 2048k | readwrite | -0.47 -0.47 (0.0023,0.0023) | 2.45 2.38 (0.0026,0.0026) | 1.76 1.78 (0.0026,0.0026) | | 4096k | readwrite | 1.88 1.77 (0.0011,0.0012) | 1.37 1.17 (0.0014,0.0014) | 1.80 1.90 (0.0013,0.0013) | | 8192k | readwrite | 1.27 1.42 (0.00057,0.00057) | 0.86 0.73 (0.00061,0.00062) | -0.99 -1.28 (0.00061,0.00062) | | 4k | write | 0.00 1.53 (0.0,0.51) | 0.00 0.35 (0.0,0.51) | 0.00 0.92 (0.0,0.52) | | 8k | write | 0.00 1.04 (0.0,0.42) | 0.00 1.01 (0.0,0.4) | 0.00 2.90 (0.0,0.44) | | 16k | write | 0.00 0.86 (0.0,0.32) | 0.00 1.89 (0.0,0.35) | 0.00 -1.38 (0.0,0.36) | | 32k | write | 0.00 0.47 (0.0,0.21) | 0.00 -0.52 (0.0,0.26) | 0.00 -1.40 (0.0,0.24) | | 64k | write | 0.00 0.30 (0.0,0.13) | 0.00 13.34 (0.0,0.14) | 0.00 2.01 (0.0,0.15) | | 128k | write | 0.00 2.24 (0.0,0.073) | 0.00 16.77 (0.0,0.076) | 0.00 -0.36 (0.0,0.085) | | 256k | write | 0.00 3.49 (0.0,0.039) | 0.00 9.76 (0.0,0.039) | 0.00 -4.52 (0.0,0.043) | | 512k | write | 0.00 4.08 (0.0,0.02) | 0.00 1.03 (0.0,0.017) | 0.00 1.05 (0.0,0.019) | | 1024k | write | 0.00 2.72 (0.0,0.0083) | 0.00 2.89 (0.0,0.0086) | 0.00 2.98 (0.0,0.0095) | | 2048k | write | 0.00 2.14 (0.0,0.0041) | 0.00 3.12 (0.0,0.0041) | 0.00 1.84 (0.0,0.0044) | | 4096k | write | 0.00 1.76 (0.0,0.002) | 0.00 1.80 (0.0,0.0026) | 0.00 6.01 (0.0,0.0025) | | 8192k | write | 0.00 1.41 (0.0,0.00099) | 0.00 0.98 (0.0,0.0012) | 0.00 0.13 (0.0,0.0012) | +---------+-----------+-------------------------------+-----------------------------+-------------------------------+ +---------+-----------+-------------------------------+------------------------------+-------------------------------+ | jobs/bs | workload | 4 | 5 | 6 | +---------+-----------+-------------------------------+------------------------------+-------------------------------+ | 4k | randread | 1.66 0.00 (1.3,0.0) | -0.81 0.00 (1.3,0.0) | -0.50 0.00 (1.2,0.0) | | 8k | randread | 2.52 0.00 (0.98,0.0) | 2.54 0.00 (0.95,0.0) | 2.52 0.00 (0.92,0.0) | | 16k | randread | 0.68 0.00 (0.65,0.0) | 3.43 0.00 (0.64,0.0) | 5.84 0.00 (0.63,0.0) | | 32k | randread | 1.88 0.00 (0.38,0.0) | 0.46 0.00 (0.38,0.0) | 2.33 0.00 (0.37,0.0) | | 64k | randread | 1.28 0.00 (0.21,0.0) | 0.64 0.00 (0.21,0.0) | -0.26 0.00 (0.21,0.0) | | 128k | randread | -0.05 0.00 (0.11,0.0) | 0.10 0.00 (0.11,0.0) | 0.09 0.00 (0.11,0.0) | | 256k | randread | -0.01 0.00 (0.059,0.0) | -1.01 0.00 (0.059,0.0) | -0.39 0.00 (0.059,0.0) | | 512k | randread | -1.17 0.00 (0.029,0.0) | 0.39 0.00 (0.028,0.0) | -0.33 0.00 (0.028,0.0) | | 1024k | randread | -0.20 0.00 (0.013,0.0) | -0.85 0.00 (0.013,0.0) | -0.57 0.00 (0.013,0.0) | | 2048k | randread | -0.07 0.00 (0.0062,0.0) | -0.26 0.00 (0.0061,0.0) | -0.15 0.00 (0.006,0.0) | | 4096k | randread | -0.25 0.00 (0.0027,0.0) | -2.70 0.00 (0.0027,0.0) | -2.35 0.00 (0.0026,0.0) | | 8192k | randread | -2.94 0.00 (0.0013,0.0) | -3.01 0.00 (0.0012,0.0) | -2.09 0.00 (0.0012,0.0) | | 4k | randrw | 2.83 2.84 (0.36,0.36) | 2.24 2.23 (0.37,0.37) | 3.49 3.50 (0.38,0.38) | | 8k | randrw | 1.31 1.32 (0.29,0.29) | 2.01 2.01 (0.3,0.3) | 2.09 2.09 (0.3,0.3) | | 16k | randrw | 1.96 1.95 (0.22,0.22) | 1.61 1.61 (0.22,0.22) | 1.99 2.00 (0.22,0.22) | | 32k | randrw | 1.01 1.03 (0.14,0.14) | 0.58 0.59 (0.14,0.14) | -0.04 -0.05 (0.14,0.14) | | 64k | randrw | -0.19 -0.18 (0.081,0.081) | -0.72 -0.72 (0.081,0.081) | -0.50 -0.50 (0.081,0.081) | | 128k | randrw | 0.42 0.42 (0.043,0.043) | -0.33 -0.36 (0.043,0.043) | -0.62 -0.59 (0.043,0.043) | | 256k | randrw | 0.38 0.41 (0.022,0.022) | -0.35 -0.35 (0.022,0.022) | 0.37 0.31 (0.022,0.022) | | 512k | randrw | 0.40 0.41 (0.011,0.011) | -0.29 -0.26 (0.011,0.011) | 2.76 2.48 (0.01,0.01) | | 1024k | randrw | 1.16 1.01 (0.0052,0.0052) | 0.74 0.72 (0.0051,0.0051) | 1.72 1.77 (0.005,0.005) | | 2048k | randrw | 1.09 0.96 (0.0026,0.0026) | 1.19 1.57 (0.0026,0.0026) | 1.49 1.21 (0.0025,0.0025) | | 4096k | randrw | -0.13 0.06 (0.0013,0.0013) | 0.69 0.77 (0.0013,0.0013) | -0.20 -0.13 (0.0012,0.0012) | | 8192k | randrw | -0.71 -1.27 (0.00059,0.00061) | -1.78 -2.02 (0.00059,0.0006) | -1.60 -1.25 (0.00058,0.00059) | | 4k | randwrite | 0.00 2.17 (0.0,0.44) | 0.00 4.08 (0.0,0.45) | 0.00 5.47 (0.0,0.46) | | 8k | randwrite | 0.00 0.98 (0.0,0.38) | 0.00 2.39 (0.0,0.39) | 0.00 2.30 (0.0,0.4) | | 16k | randwrite | 0.00 2.02 (0.0,0.3) | 0.00 2.63 (0.0,0.3) | 0.00 3.17 (0.0,0.3) | | 32k | randwrite | 0.00 1.82 (0.0,0.21) | 0.00 1.12 (0.0,0.22) | 0.00 1.40 (0.0,0.21) | | 64k | randwrite | 0.00 1.41 (0.0,0.14) | 0.00 1.92 (0.0,0.13) | 0.00 1.76 (0.0,0.13) | | 128k | randwrite | 0.00 2.32 (0.0,0.075) | 0.00 4.61 (0.0,0.074) | 0.00 2.31 (0.0,0.074) | | 256k | randwrite | 0.00 -0.77 (0.0,0.038) | 0.00 2.61 (0.0,0.036) | 0.00 2.48 (0.0,0.036) | | 512k | randwrite | 0.00 1.83 (0.0,0.019) | 0.00 1.68 (0.0,0.018) | 0.00 2.80 (0.0,0.018) | | 1024k | randwrite | 0.00 3.32 (0.0,0.0086) | 0.00 1.20 (0.0,0.0087) | 0.00 0.92 (0.0,0.0081) | | 2048k | randwrite | 0.00 0.92 (0.0,0.0043) | 0.00 2.95 (0.0,0.0042) | 0.00 3.15 (0.0,0.0042) | | 4096k | randwrite | 0.00 3.22 (0.0,0.0025) | 0.00 0.50 (0.0,0.0024) | 0.00 0.40 (0.0,0.0024) | | 8192k | randwrite | 0.00 -0.57 (0.0,0.0012) | 0.00 -0.41 (0.0,0.0011) | 0.00 -0.36 (0.0,0.0011) | | 4k | read | 4.34 0.00 (2.5,0.0) | -0.40 0.00 (2.6,0.0) | -8.45 0.00 (2.6,0.0) | | 8k | read | -1.43 0.00 (1.7,0.0) | 0.01 0.00 (1.7,0.0) | -3.89 0.00 (1.7,0.0) | | 16k | read | 1.68 0.00 (0.96,0.0) | -0.38 0.00 (0.94,0.0) | 0.47 0.00 (0.91,0.0) | | 32k | read | -0.98 0.00 (0.48,0.0) | -0.09 0.00 (0.47,0.0) | -1.24 0.00 (0.47,0.0) | | 64k | read | -0.42 0.00 (0.25,0.0) | -0.26 0.00 (0.25,0.0) | -0.94 0.00 (0.25,0.0) | | 128k | read | -0.49 0.00 (0.12,0.0) | 0.06 0.00 (0.12,0.0) | -0.59 0.00 (0.12,0.0) | | 256k | read | -0.89 0.00 (0.062,0.0) | -0.11 0.00 (0.062,0.0) | -0.77 0.00 (0.062,0.0) | | 512k | read | -0.64 0.00 (0.03,0.0) | -0.11 0.00 (0.03,0.0) | 0.08 0.00 (0.03,0.0) | | 1024k | read | 0.00 0.00 (0.013,0.0) | -0.05 0.00 (0.013,0.0) | 0.42 0.00 (0.013,0.0) | | 2048k | read | -0.69 0.00 (0.0063,0.0) | -0.36 0.00 (0.0063,0.0) | 1.12 0.00 (0.006,0.0) | | 4096k | read | -2.69 0.00 (0.0029,0.0) | -1.85 0.00 (0.0027,0.0) | -1.13 0.00 (0.0026,0.0) | | 8192k | read | -2.15 0.00 (0.0013,0.0) | -1.66 0.00 (0.0013,0.0) | -2.90 0.00 (0.0012,0.0) | | 4k | readwrite | 0.32 0.32 (0.46,0.46) | 0.68 0.69 (0.47,0.47) | -0.26 -0.26 (0.5,0.5) | | 8k | readwrite | 0.18 0.18 (0.37,0.37) | 0.77 0.76 (0.38,0.38) | -0.47 -0.48 (0.39,0.39) | | 16k | readwrite | 0.24 0.25 (0.27,0.27) | -0.17 -0.15 (0.27,0.27) | -0.51 -0.52 (0.27,0.27) | | 32k | readwrite | -0.91 -0.91 (0.17,0.17) | -1.40 -1.37 (0.17,0.17) | -1.67 -1.70 (0.17,0.17) | | 64k | readwrite | -1.22 -1.21 (0.09,0.09) | -1.33 -1.30 (0.09,0.09) | -2.49 -2.50 (0.091,0.091) | | 128k | readwrite | -0.67 -0.69 (0.045,0.045) | -1.23 -1.24 (0.045,0.045) | -1.01 -0.96 (0.045,0.045) | | 256k | readwrite | -0.31 -0.35 (0.023,0.023) | -0.28 -0.28 (0.023,0.023) | 0.25 0.08 (0.022,0.023) | | 512k | readwrite | 0.77 0.72 (0.011,0.011) | 0.96 0.96 (0.011,0.011) | 0.62 1.16 (0.011,0.011) | | 1024k | readwrite | 0.93 0.91 (0.0053,0.0053) | 0.72 0.78 (0.0051,0.0051) | -0.48 -0.10 (0.0051,0.0051) | | 2048k | readwrite | 1.84 1.77 (0.0026,0.0026) | 0.86 0.71 (0.0026,0.0026) | 0.31 1.37 (0.0026,0.0026) | | 4096k | readwrite | 2.71 2.43 (0.0013,0.0013) | 1.54 1.73 (0.0013,0.0013) | -1.18 -0.79 (0.0012,0.0013) | | 8192k | readwrite | -2.61 -1.52 (0.0006,0.00061) | -1.83 -1.27 (0.00059,0.0006) | -2.25 -1.53 (0.00059,0.00059) | | 4k | write | 0.00 -2.94 (0.0,0.53) | 0.00 -2.23 (0.0,0.57) | 0.00 0.93 (0.0,0.56) | | 8k | write | 0.00 -1.78 (0.0,0.45) | 0.00 -1.14 (0.0,0.47) | 0.00 0.47 (0.0,0.47) | | 16k | write | 0.00 -1.46 (0.0,0.35) | 0.00 -1.46 (0.0,0.36) | 0.00 0.25 (0.0,0.36) | | 32k | write | 0.00 -1.05 (0.0,0.24) | 0.00 -1.53 (0.0,0.24) | 0.00 -0.74 (0.0,0.24) | | 64k | write | 0.00 -2.78 (0.0,0.15) | 0.00 1.39 (0.0,0.15) | 0.00 -2.42 (0.0,0.15) | | 128k | write | 0.00 -0.03 (0.0,0.082) | 0.00 0.32 (0.0,0.081) | 0.00 2.76 (0.0,0.079) | | 256k | write | 0.00 -0.33 (0.0,0.039) | 0.00 -0.32 (0.0,0.038) | 0.00 -2.37 (0.0,0.038) | | 512k | write | 0.00 4.00 (0.0,0.019) | 0.00 6.45 (0.0,0.02) | 0.00 2.94 (0.0,0.019) | | 1024k | write | 0.00 1.22 (0.0,0.0088) | 0.00 1.57 (0.0,0.0088) | 0.00 -3.98 (0.0,0.0087) | | 2048k | write | 0.00 0.05 (0.0,0.0043) | 0.00 3.33 (0.0,0.0044) | 0.00 8.69 (0.0,0.0044) | | 4096k | write | 0.00 2.36 (0.0,0.0025) | 0.00 1.52 (0.0,0.0024) | 0.00 0.44 (0.0,0.0024) | | 8192k | write | 0.00 -0.35 (0.0,0.0012) | 0.00 -0.45 (0.0,0.0011) | 0.00 -0.73 (0.0,0.0011) | +---------+-----------+-------------------------------+------------------------------+-------------------------------+ Andreas Hindborg (9): rust: add radix tree abstraction rust: add `pages` module for handling page allocation rust: block: introduce `kernel::block::mq` module rust: block: introduce `kernel::block::bio` module RUST: add `module_params` macro rust: apply cache line padding for `SpinLock` RUST: implement `ForeignOwnable` for `Pin` rust: add null block driver rust: inline a number of short functions Wedson Almeida Filho (2): rust: lock: add support for `Lock::lock_irqsave` rust: lock: implement `IrqSaveBackend` for `SpinLock` drivers/block/Kconfig | 4 + drivers/block/Makefile | 4 + drivers/block/rnull-helpers.c | 60 ++++ drivers/block/rnull.rs | 177 ++++++++++ rust/bindings/bindings_helper.h | 4 + rust/bindings/lib.rs | 1 + rust/helpers.c | 91 ++++++ rust/kernel/block.rs | 6 + rust/kernel/block/bio.rs | 93 ++++++ rust/kernel/block/bio/vec.rs | 181 +++++++++++ rust/kernel/block/mq.rs | 15 + rust/kernel/block/mq/gen_disk.rs | 133 ++++++++ rust/kernel/block/mq/operations.rs | 260 +++++++++++++++ rust/kernel/block/mq/raw_writer.rs | 30 ++ rust/kernel/block/mq/request.rs | 87 +++++ rust/kernel/block/mq/tag_set.rs | 92 ++++++ rust/kernel/cache_padded.rs | 33 ++ rust/kernel/error.rs | 4 + rust/kernel/lib.rs | 13 + rust/kernel/module_param.rs | 501 +++++++++++++++++++++++++++++ rust/kernel/pages.rs | 284 ++++++++++++++++ rust/kernel/radix_tree.rs | 156 +++++++++ rust/kernel/sync/lock.rs | 49 ++- rust/kernel/sync/lock/mutex.rs | 2 + rust/kernel/sync/lock/spinlock.rs | 50 ++- rust/kernel/types.rs | 30 ++ rust/macros/helpers.rs | 46 ++- rust/macros/module.rs | 402 +++++++++++++++++++++-- scripts/Makefile.build | 2 +- 29 files changed, 2766 insertions(+), 44 deletions(-) create mode 100644 drivers/block/rnull-helpers.c create mode 100644 drivers/block/rnull.rs create mode 100644 rust/kernel/block.rs create mode 100644 rust/kernel/block/bio.rs create mode 100644 rust/kernel/block/bio/vec.rs create mode 100644 rust/kernel/block/mq.rs create mode 100644 rust/kernel/block/mq/gen_disk.rs create mode 100644 rust/kernel/block/mq/operations.rs create mode 100644 rust/kernel/block/mq/raw_writer.rs create mode 100644 rust/kernel/block/mq/request.rs create mode 100644 rust/kernel/block/mq/tag_set.rs create mode 100644 rust/kernel/cache_padded.rs create mode 100644 rust/kernel/module_param.rs create mode 100644 rust/kernel/pages.rs create mode 100644 rust/kernel/radix_tree.rs base-commit: ea76e08f4d901a450619831a255e9e0a4c0ed162 -- 2.40.0
