mainlining shenanigans
2cdb3909c9
Looking at perf data for a fio workload I noticed that we were spending
a pretty large chunk of time (around 5%) doing percpu_counter_sum() in
need_preemptive_reclaim. This is silly, as we only want to know if we
have more ordered than delalloc to see if we should be counting the
delayed items in our threshold calculation. Change this to
percpu_read_positive() to avoid the overhead.
I ran this through fsperf to validate the changes, obviously the latency
numbers in dbench and fio are quite jittery, so take them as you wish,
but overall the improvements on throughput, iops, and bw are all
positive. Each test was run two times, the given value is the average
of both runs for their respective column.
btrfs ssd normal test results
bufferedrandwrite16g results
metric baseline current diff
==========================================================
write_io_kbytes 16777216 16777216 0.00%
read_clat_ns_p99 0 0 0.00%
write_bw_bytes 1.04e+08 1.05e+08 1.12%
read_iops 0 0 0.00%
write_clat_ns_p50 13888 11840 -14.75%
read_io_kbytes 0 0 0.00%
read_io_bytes 0 0 0.00%
write_clat_ns_p99 35008 29312 -16.27%
read_bw_bytes 0 0 0.00%
elapsed 170 167 -1.76%
write_lat_ns_min 4221.50 3762.50 -10.87%
sys_cpu 39.65 35.37 -10.79%
write_lat_ns_max 2.67e+10 2.50e+10 -6.63%
read_lat_ns_min 0 0 0.00%
write_iops 25270.10 25553.43 1.12%
read_lat_ns_max 0 0 0.00%
read_clat_ns_p50 0 0 0.00%
dbench60 results
metric baseline current diff
==================================================
qpathinfo 11.12 12.73 14.52%
throughput 416.09 445.66 7.11%
flush 3485.63 1887.55 -45.85%
qfileinfo 0.70 1.92 173.86%
ntcreatex 992.60 695.76 -29.91%
qfsinfo 2.43 3.71 52.48%
close 1.67 3.14 88.09%
sfileinfo 66.54 105.20 58.10%
rename 809.23 619.59 -23.43%
find 16.88 15.46 -8.41%
unlink 820.54 670.86 -18.24%
writex 3375.20 2637.91 -21.84%
deltree 386.33 449.98 16.48%
readx 3.43 3.41 -0.60%
mkdir 0.05 0.03 -38.46%
lockx 0.26 0.26 -0.76%
unlockx 0.81 0.32 -60.33%
dio4kbs16threads results
metric baseline current diff
================================================================
write_io_kbytes 5249676 3357150 -36.05%
read_clat_ns_p99 0 0 0.00%
write_bw_bytes 89583501.50 57291192.50 -36.05%
read_iops 0 0 0.00%
write_clat_ns_p50 242688 263680 8.65%
read_io_kbytes 0 0 0.00%
read_io_bytes 0 0 0.00%
write_clat_ns_p99 15826944 36732928 132.09%
read_bw_bytes 0 0 0.00%
elapsed 61 61 0.00%
write_lat_ns_min 42704 42095 -1.43%
sys_cpu 5.27 3.45 -34.52%
write_lat_ns_max 7.43e+08 9.27e+08 24.71%
read_lat_ns_min 0 0 0.00%
write_iops 21870.97 13987.11 -36.05%
read_lat_ns_max 0 0 0.00%
read_clat_ns_p50 0 0 0.00%
randwrite2xram results
metric baseline current diff
================================================================
write_io_kbytes 24831972 28876262 16.29%
read_clat_ns_p99 0 0 0.00%
write_bw_bytes 83745273.50 92182192.50 10.07%
read_iops 0 0 0.00%
write_clat_ns_p50 13952 11648 -16.51%
read_io_kbytes 0 0 0.00%
read_io_bytes 0 0 0.00%
write_clat_ns_p99 50176 52992 5.61%
read_bw_bytes 0 0 0.00%
elapsed 314 332 5.73%
write_lat_ns_min 5920.50 5127 -13.40%
sys_cpu 7.82 7.35 -6.07%
write_lat_ns_max 5.27e+10 3.88e+10 -26.44%
read_lat_ns_min 0 0 0.00%
write_iops 20445.62 22505.42 10.07%
read_lat_ns_max 0 0 0.00%
read_clat_ns_p50 0 0 0.00%
untarfirefox results
metric baseline current diff
==============================================
elapsed 47.41 47.40 -0.03%
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.