src-test/sys/geom/raid/md_nvidia.c, branch main

geom: clean up empty lines in .c and .h files

2020-09-01T22:14:09Z

sys/geom: consistently use _PATH_DEV instead of hardcoding "/dev/".

2020-07-09T02:52:39Z

Reviewed by: cem MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D25565

GEOM: Reduce unnecessary log interleaving with sbufs

2019-08-07T19:28:35Z

Similar to what was done for device_printfs in r347229. Convert g_print_bio() to a thin shim around g_format_bio(), which acts on an sbuf; documented in g_bio.9. Reviewed by: markj Discussed with: rlibby Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D21165

sys/geom: adoption of SPDX licensing ID tags.

2017-11-27T15:17:37Z

Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.

Fix improper use of "its".

2016-11-08T23:59:41Z

Clean out some externally visible "more then" grammar

2015-08-11T03:12:09Z

MFC after: 3 days

Replace constant with proper sizeof().

2015-02-25T10:18:11Z

Submitted by: Dmitry Luhtionov MFC after: 2 weeks

Avoid unneeded malloc/memcpy/free if there is no metadata on disk.

2014-12-05T10:23:18Z

Submitted by: Dmitry Luhtionov MFC after: 2 weeks

Reduce number of opens by REOM RAID during provider taste.

2014-04-28T15:03:52Z

Instead opening/closing provider by each of metadata classes, do it only once in core code. Since for SCSI disks open/close means sending some SCSI commands to the device, this change reduces taste time. MFC after: 2 weeks Sponsored by: iXsystems, Inc.

Merge GEOM direct dispatch changes from the projects/camlock branch.

2013-10-22T08:22:19Z

When safety requirements are met, it allows to avoid passing I/O requests to GEOM g_up/g_down thread, executing them directly in the caller context. That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid several context switches per I/O. The defined now safety requirements are: - caller should not hold any locks and should be reenterable; - callee should not depend on GEOM dual-threaded concurency semantics; - on the way down, if request is unmapped while callee doesn't support it, the context should be sleepable; - kernel thread stack usage should be below 50%. To keep compatibility with GEOM classes not meeting above requirements new provider and consumer flags added: - G_CF_DIRECT_SEND -- consumer code meets caller requirements (request); - G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done); - G_PF_DIRECT_SEND -- provider code meets caller requirements (done); - G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request). Capable GEOM class can set them, allowing direct dispatch in cases where it is safe. If any of requirements are not met, request is queued to g_up or g_down thread same as before. Such GEOM classes were reviewed and updated to support direct dispatch: CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE, VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL, MAP, FLASHMAP, etc). To declare direct completion capability disk(9) KPI got new flag equivalent to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk drivers got it set now thanks to earlier CAM locking work. This change more then twice increases peak block storage performance on systems with manu CPUs, together with earlier CAM locking changes reaching more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to 256 user-level threads). Sponsored by: iXsystems, Inc. MFC after: 2 months