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3bae917061
freebsd-dev/sys
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Alexander Motin 3bae917061 Minimize aggsum_compare(&arc_size, arc_c) calls. 
For busy ARC situation when arc_size close to arc_c is desired.  But
then it is quite likely that aggsum_compare(&arc_size, arc_c) will need
to flush per-CPU buckets to find exact comparison result.  Doing that
often in a hot path penalizes whole idea of aggsum usage there, since it
replaces few simple atomic additions with dozens of lock acquisitions.

Replacing aggsum_compare() with aggsum_upper_bound() in code increasing
arc_p when ARC is growing (arc_size < arc_c) according to PMC profiles
allows to save ~5% of CPU time in aggsum code during sequential write
to 12 ZVOLs with 16KB block size on large dual-socket system.

I suppose there some minor arc_p behavior change due to lower precision
of the new code, but I don't think it is a big deal, since it should
affect only very small window in time (aggsum buckets are flushed every
second) and in ARC size (buckets are limited to 10 average ARC blocks
per CPU).

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
2019-06-14 20:04:28 +00:00
..
amd64 Implement an alternative solution to the amd64 and i386 pmap problem that we 2019-06-09 03:36:10 +00:00
arm A bit of code hygiene (no functional changes). 2019-06-10 23:25:40 +00:00
arm64 Change the arm64 pmap so that updates to the global count of wired pages are 2019-06-14 04:01:08 +00:00
bsm Create new EINTEGRITY error with message "Integrity check failed". 2019-01-17 06:35:45 +00:00
cam Minor white space changes. 2019-06-11 20:48:19 +00:00
cddl Minimize aggsum_compare(&arc_size, arc_c) calls. 2019-06-14 20:04:28 +00:00
compat Replace uses of vm_page_unwire(m, PQ_NONE) with vm_page_unwire_noq(m). 2019-06-07 18:23:29 +00:00
conf Restore genassym.o to CLEANFILES. 2019-06-11 23:35:34 +00:00
contrib Whitespace adjustments replacing spaces with tabs. 2019-06-12 11:18:11 +00:00
crypto aesni(4): Fix trivial type typo 2019-05-27 00:47:51 +00:00
ddb Extract eventfilter declarations to sys/_eventfilter.h 2019-05-20 00:38:23 +00:00
dev Don't print the request we may be aborting in ciss_notify_abort as 2019-06-13 05:19:42 +00:00
dts arm64: Add support for NanoPI NEO2 2019-05-02 12:56:13 +00:00
fs Manually clear text references on reclaim for nullfs and tmpfs. 2019-06-05 20:16:25 +00:00
gdb
geom geli: style nits 2019-06-12 19:29:48 +00:00
gnu dts: Import files from Linux 5.1 2019-05-08 19:27:30 +00:00
i386 Implement an alternative solution to the amd64 and i386 pmap problem that we 2019-06-09 03:36:10 +00:00
isa
kern Update td_runtime of running thread on each statclock(). 2019-06-14 01:09:10 +00:00
kgssapi Make the warning intervals for deprecated crypto algorithms tunable. 2019-06-11 23:00:55 +00:00
libkern random(4): depessimize arc4random 2019-05-12 06:32:46 +00:00
mips Replace uses of vm_page_unwire(m, PQ_NONE) with vm_page_unwire_noq(m). 2019-06-07 18:23:29 +00:00
modules Add opt_cam.h so we can build this outside of a kernel build. 2019-06-13 22:03:53 +00:00
net Restore the comment removed in r348745. 2019-06-06 17:20:35 +00:00
net80211 Enhance the comment ieee80211_add_channel() to avoid a 2019-06-10 14:31:18 +00:00
netgraph Remove 'dir' argument in ng_ipfw_input, since ip_fw_args now has this info. 2019-03-14 22:30:05 +00:00
netinet Sort opt_foo.h #includes and add a missing blank line in ip_output(). 2019-06-11 22:07:39 +00:00
netinet6 Sort opt_foo.h #includes and add a missing blank line in ip_output(). 2019-06-11 22:07:39 +00:00
netipsec Make the warning intervals for deprecated crypto algorithms tunable. 2019-06-11 23:00:55 +00:00
netpfil Initialize V_nat64out methods explicitly. 2019-06-05 09:25:40 +00:00
netsmb Remove unused argument to priv_check_cred. 2018-12-11 19:32:16 +00:00
nfs
nfsclient
nfsserver
nlm
ofed Fix prio vs. nonprio tagged traffic in RDMACM 2019-06-04 06:21:31 +00:00
opencrypto Move declaration of warninterval out from under COMPAT_FREEBSD32. 2019-06-11 23:28:07 +00:00
powerpc Fix PPC970 boot after r348783 2019-06-12 15:58:11 +00:00
riscv RISC-V: expose extension bits in AT_HWCAP 2019-06-11 00:55:54 +00:00
rpc Fix malloc stats for the RPCSEC_GSS server code when DEBUG is enabled. 2019-04-04 01:23:06 +00:00
security Extract eventfilter declarations to sys/_eventfilter.h 2019-05-20 00:38:23 +00:00
sparc64 FCP-101: Remove wb(4) 2019-05-17 15:24:34 +00:00
sys Some devices take undesired actions when RTS and DTR are 2019-06-12 18:07:04 +00:00
teken Attempt to complete fixing programmable function keys for syscons. 2019-02-20 02:14:41 +00:00
tests Regularize the Netflix copyright 2019-02-04 21:28:25 +00:00
tools Add SDIO support. 2019-06-08 16:26:56 +00:00
ufs Add a missing bresle() in seldom-used error return. 2019-05-28 17:31:35 +00:00
vm Avoid using the prev field of vm_map_entry_t in two functions that 2019-06-14 03:15:54 +00:00
x86 Currently, MCA entries remain on an every-growing linked list. This means 2019-06-08 18:26:48 +00:00
xdr
xen xen: introduce a new way to setup event channel upcall 2019-01-30 11:34:52 +00:00
Makefile