# git rev-parse -q --verify 9ccce092fc64d19504fa54de4fd659e279cc92e7^{commit}
9ccce092fc64d19504fa54de4fd659e279cc92e7
already have revision, skipping fetch
# git checkout -q -f -B kisskb 9ccce092fc64d19504fa54de4fd659e279cc92e7
# git clean -qxdf
# < git log -1
# commit 9ccce092fc64d19504fa54de4fd659e279cc92e7
# Merge: 27787ba3fa49 211f9f2e0503
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun May 2 14:13:46 2021 -0700
# 
#     Merge tag 'for-linus-5.13-ofs-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
#     
#     Pull orangefs updates from Mike Marshall:
#      "orangefs: implement orangefs_readahead
#     
#       mm/readahead.c/read_pages was quite a bit different back when I put my
#       open-coded readahead logic into orangefs_readpage. That logic seemed
#       to work as designed back then, it is a trainwreck now.
#     
#       This implements orangefs_readahead using the new xarray and
#       readahead_expand features and removes all my open-coded readahead
#       logic.
#     
#       This results in an extreme read performance improvement, these sample
#       numbers are from my test VM:
#     
#       Here's an example of what's upstream in
#       5.11.8-200.fc33.x86_64:
#     
#          30+0 records in
#          30+0 records out
#          125829120 bytes (126 MB, 120 MiB) copied, 5.77943 s, 21.8 MB/s
#     
#       And here's this version of orangefs_readahead on top of 5.12.0-rc4:
#     
#          30+0 records in
#          30+0 records out
#          125829120 bytes (126 MB, 120 MiB) copied, 0.325919 s, 386 MB/s
#     
#       There are four xfstest regressions with this patch. David Howells and
#       Matthew Wilcox have been helping me work with this code"
#     
#     * tag 'for-linus-5.13-ofs-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux:
#       orangefs: leave files in the page cache for a few micro seconds at least
#       Orangef: implement orangefs_readahead.
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/mips-linux/bin/mips-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/mips-linux/bin/mips-linux-ld --version
# < git log --format=%s --max-count=1 9ccce092fc64d19504fa54de4fd659e279cc92e7
# < make -s -j 8 ARCH=mips O=/kisskb/build/linus_ip22_defconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/mips-linux/bin/mips-linux-  ip22_defconfig
# < make -s -j 8 ARCH=mips O=/kisskb/build/linus_ip22_defconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/mips-linux/bin/mips-linux-  help
# make -s -j 8 ARCH=mips O=/kisskb/build/linus_ip22_defconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/mips-linux/bin/mips-linux-  olddefconfig
# make -s -j 8 ARCH=mips O=/kisskb/build/linus_ip22_defconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/mips-linux/bin/mips-linux-  
Completed OK
# rm -rf /kisskb/build/linus_ip22_defconfig_mips-gcc8
# Build took: 0:02:55.281118