# git rev-parse -q --verify adfc3ded5c33d67e822525f95404ef0becb099b8^{commit}
adfc3ded5c33d67e822525f95404ef0becb099b8
already have revision, skipping fetch
# git checkout -q -f -B kisskb adfc3ded5c33d67e822525f95404ef0becb099b8
# git clean -qxdf
# < git log -1
# commit adfc3ded5c33d67e822525f95404ef0becb099b8
# Merge: 26bb0d3f38a7 50c52250e2d7
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Sep 16 13:50:14 2024 +0200
# 
#     Merge tag 'for-6.12/io_uring-discard-20240913' of git://git.kernel.dk/linux
#     
#     Pull io_uring async discard support from Jens Axboe:
#      "Sitting on top of both the 6.12 block and io_uring core branches,
#       here's support for async discard through io_uring.
#     
#       This allows applications to issue async discards, rather than rely on
#       the blocking sync ioctl discards we already have. The sync support is
#       difficult to use outside of idle/cleanup periods.
#     
#       On a real (but slow) device, testing shows the following results when
#       compared to sync discard:
#     
#             qd64 sync discard: 21K IOPS, lat avg 3 msec (max 21 msec)
#             qd64 async discard: 76K IOPS, lat avg 845 usec (max 2.2 msec)
#     
#             qd64 sync discard: 14K IOPS, lat avg 5 msec (max 25 msec)
#             qd64 async discard: 56K IOPS, lat avg 1153 usec (max 3.6 msec)
#     
#       and synthetic null_blk testing with the same queue depth and block
#       size settings as above shows:
#     
#             Type    Trim size       IOPS    Lat avg (usec)  Lat Max (usec)
#             ==============================================================
#             sync    4k               144K       444            20314
#             async   4k              1353K        47              595
#             sync    1M                56K      1136            21031
#             async   1M                94K       680              760"
#     
#     * tag 'for-6.12/io_uring-discard-20240913' of git://git.kernel.dk/linux:
#       block: implement async io_uring discard cmd
#       block: introduce blk_validate_byte_range()
#       filemap: introduce filemap_invalidate_pages
#       io_uring/cmd: give inline space in request to cmds
#       io_uring/cmd: expose iowq to cmds
# < /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 adfc3ded5c33d67e822525f95404ef0becb099b8
# make -s -j 24 ARCH=um O=/kisskb/build/linus_defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 defconfig
# < make -s -j 24 ARCH=um O=/kisskb/build/linus_defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 help
# make -s -j 24 ARCH=um O=/kisskb/build/linus_defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig
# make -s -j 24 ARCH=um O=/kisskb/build/linus_defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 
  LINK linux
Completed OK
# rm -rf /kisskb/build/linus_defconfig_um-x86_64-gcc12
# Build took: 0:01:37.669721