android_kernel_motorola_sm6375

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Filename	Latest commit message	Latest commit date
Filipe Manana 1fe3375cf2 btrfs: do not pin logs too early during renames [ Upstream commit bd54f381a12ac695593271a663d36d14220215b2 ] During renames we pin the logs of the roots a bit too early, before the calls to btrfs_insert_inode_ref(). We can pin the logs after those calls, since those will not change anything in a log tree. In a scenario where we have multiple and diverse filesystem operations running in parallel, those calls can take a significant amount of time, due to lock contention on extent buffers, and delay log commits from other tasks for longer than necessary. So just pin logs after calls to btrfs_insert_inode_ref() and right before the first operation that can update a log tree. The following script that uses dbench was used for testing: $ cat dbench-test.sh #!/bin/bash DEV=/dev/nvme0n1 MNT=/mnt/nvme0n1 MOUNT_OPTIONS="-o ssd" MKFS_OPTIONS="-m single -d single" echo "performance" \| tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor umount $DEV &> /dev/null mkfs.btrfs -f $MKFS_OPTIONS $DEV mount $MOUNT_OPTIONS $DEV $MNT dbench -D $MNT -t 120 16 umount $MNT The tests were run on a machine with 12 cores, 64G of RAN, a NVMe device and using a non-debug kernel config (Debian's default config). The results compare a branch without this patch and without the previous patch in the series, that has the subject: "btrfs: eliminate some false positives when checking if inode was logged" Versus the same branch with these two patches applied. dbench with 8 clients, results before: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 4391359 0.009 249.745 Close 3225882 0.001 3.243 Rename 185953 0.065 240.643 Unlink 886669 0.049 249.906 Deltree 112 2.455 217.433 Mkdir 56 0.002 0.004 Qpathinfo 3980281 0.004 3.109 Qfileinfo 697579 0.001 0.187 Qfsinfo 729780 0.002 2.424 Sfileinfo 357764 0.004 1.415 Find 1538861 0.016 4.863 WriteX `2189666` 0.010 3.327 ReadX 6883443 0.002 0.729 LockX 14298 0.002 0.073 UnlockX 14298 0.001 0.042 Flush 307777 2.447 303.663 Throughput 1149.6 MB/sec 8 clients 8 procs max_latency=303.666 ms dbench with 8 clients, results after: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 4269920 0.009 213.532 Close 3136653 0.001 0.690 Rename 180805 0.082 213.858 Unlink 862189 0.050 172.893 Deltree 112 2.998 218.328 Mkdir 56 0.002 0.003 Qpathinfo 3870158 0.004 5.072 Qfileinfo 678375 0.001 0.194 Qfsinfo 709604 0.002 0.485 Sfileinfo 347850 0.004 1.304 Find 1496310 0.017 5.504 WriteX 2129613 0.010 2.882 ReadX 6693066 0.002 1.517 LockX 13902 0.002 0.075 UnlockX 13902 0.001 0.055 Flush 299276 2.511 220.189 Throughput 1187.33 MB/sec 8 clients 8 procs max_latency=220.194 ms +3.2% throughput, -31.8% max latency dbench with 16 clients, results before: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 5978334 0.028 156.507 Close 4391598 0.001 1.345 Rename 253136 0.241 155.057 Unlink 1207220 0.182 257.344 Deltree 160 6.123 36.277 Mkdir 80 0.003 0.005 Qpathinfo 5418817 0.012 6.867 Qfileinfo 949929 0.001 0.941 Qfsinfo 993560 0.002 1.386 Sfileinfo 486904 0.004 2.829 Find 2095088 0.059 8.164 WriteX 2982319 0.017 9.029 ReadX 9371484 0.002 4.052 LockX 19470 0.002 0.461 UnlockX 19470 0.001 0.990 Flush 418936 2.740 347.902 Throughput 1495.31 MB/sec 16 clients 16 procs max_latency=347.909 ms dbench with 16 clients, results after: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 5711833 0.029 131.240 Close 4195897 0.001 1.732 Rename 241849 0.204 147.831 Unlink 1153341 0.184 231.322 Deltree 160 6.086 30.198 Mkdir 80 0.003 0.021 Qpathinfo 5177011 0.012 7.150 Qfileinfo 907768 0.001 0.793 Qfsinfo 949205 0.002 1.431 Sfileinfo 465317 0.004 2.454 Find 2001541 0.058 7.819 WriteX 2850661 0.017 9.110 ReadX 8952289 0.002 3.991 LockX 18596 0.002 0.655 UnlockX 18596 0.001 0.179 Flush 400342 2.879 293.607 Throughput 1565.73 MB/sec 16 clients 16 procs max_latency=293.611 ms +4.6% throughput, -16.9% max latency Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-09-05 10:27:46 +02:00
arch	x86/bugs: Add "unknown" reporting for MMIO Stale Data	2022-09-05 10:27:45 +02:00
block	blk-mq: don't create hctx debugfs dir until q->debugfs_dir is created	2022-08-25 11:17:36 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:11:22 +02:00
crypto	crypto: drbg - make reseeding from get_random_bytes() synchronous	2022-06-22 14:11:18 +02:00
Documentation	x86/bugs: Add "unknown" reporting for MMIO Stale Data	2022-09-05 10:27:45 +02:00
drivers	fbdev: fb_pm2fb: Avoid potential divide by zero error	2022-09-05 10:27:45 +02:00
fs	btrfs: do not pin logs too early during renames	2022-09-05 10:27:46 +02:00
include	mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse	2022-09-05 10:27:46 +02:00
init	random: handle latent entropy and command line from random_init()	2022-06-22 14:11:17 +02:00
ipc	ipc/mqueue: use get_tree_nodev() in mqueue_get_tree()	2022-06-14 18:11:41 +02:00
kernel	ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead	2022-09-05 10:27:45 +02:00
lib	ratelimit: Fix data-races in ___ratelimit().	2022-09-05 10:27:42 +02:00
LICENSES
mm	mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse	2022-09-05 10:27:46 +02:00
net	bpf: Don't redirect packets with invalid pkt_len	2022-09-05 10:27:46 +02:00
samples
scripts	kbuild: Fix include path in scripts/Makefile.modpost	2022-09-05 10:27:45 +02:00
security	apparmor: Fix memleak in aa_simple_write_to_buffer()	2022-08-25 11:18:21 +02:00
sound	ALSA: timer: Use deferred fasync helper	2022-08-25 11:18:38 +02:00
tools	Revert "selftests/bpf: Fix test_align verifier log patterns"	2022-09-05 10:27:39 +02:00
usr
virt	KVM: Add infrastructure and macro to mark VM as bugged	2022-08-25 11:18:16 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	MAINTAINERS: co-maintain random.c	2022-06-22 14:11:05 +02:00
Makefile	Linux 5.4.211	2022-08-25 11:18:40 +02:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.