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freebsd-nq/sys/geom
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Alexander Motin 02a9923034 Switch from mutexes to atomics in GEOM_DEV I/O path. 
Mutexes in I/O path there were used twice per I/O to atomically access
several variables to close and/or destroy the device on last request
completion.  I found the way to fit all required info into one integer,
suitable for atomic operations.  It opened race window on device close,
but addition of timeout to the msleep() there should cover it.

Profiling shows removal of significant spinning time on those mutexes
and IOPS increase from ~600K to >800K to NVMe on 72-core systems.

MFC after:	1 month
Sponsored by:	iXsystems, Inc.
2018-12-27 19:15:24 +00:00
..
bde Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
cache Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
concat Have gconcat advertise delete support if one of its disks does. 2018-10-30 00:22:14 +00:00
eli Restore backward compatibility for "attach" verb. 2018-10-27 03:37:14 +00:00
gate geom_gate: enable resize 2018-07-13 07:08:06 +00:00
journal Normally when an attempt is made to mount a UFS/FFS filesystem whose 2018-12-06 00:09:39 +00:00
label Normally when an attempt is made to mount a UFS/FFS filesystem whose 2018-12-06 00:09:39 +00:00
linux_lvm Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
mirror gmirror: Remove a last-minute INVARIANTS breakage in r341840 2018-12-12 18:13:56 +00:00
mountver Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
multipath Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
nop Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
part Add a “skip_dsn” option to g_part's bootcode verb to prevent g_part_mbr 2018-11-27 14:58:19 +00:00
raid Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
raid3 Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
sched sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
shsec Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
stripe Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
uzip Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
vinum Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
virstor Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
zero Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom_bsd_enc.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_bsd.c Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom_ccd.c Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom_ctl.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_ctl.h sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_dev.c Switch from mutexes to atomics in GEOM_DEV I/O path. 2018-12-27 19:15:24 +00:00
geom_disk.c geom_disk / scsi_da: deny opening write-protected disks for writing 2018-01-15 11:20:00 +00:00
geom_disk.h Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
geom_dump.c Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
geom_event.c Instrument "boot holds" for the benefit of the TSLOG framework. These 2017-12-31 09:23:52 +00:00
geom_flashmap.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_fox.c Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom_int.h sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_io.c Revert r340187, it breaks EOD (end-of-device) detection logic. Turns out, 2018-11-07 16:28:09 +00:00
geom_kern.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_map.c Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom_mbr_enc.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_mbr.c Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom_redboot.c Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
geom_slice.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_slice.h sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_subr.c Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
geom_sunlabel_enc.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_sunlabel.c Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom_vfs.c sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_vfs.h sys/geom: adoption of SPDX licensing ID tags. 2017-11-27 15:17:37 +00:00
geom_vol_ffs.c Annotate geom modules with MODULE_VERSION 2018-04-10 19:18:16 +00:00
geom.h Extend stripeoffset and stripesize of GEOMs from u_int to off_t 2018-10-27 16:14:42 +00:00
notes