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Linus Torvalds 5695e51619 io_uring-worker.v3-2021-02-25
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Merge tag 'io_uring-worker.v3-2021-02-25' of git://git.kernel.dk/linux-block

Pull io_uring thread rewrite from Jens Axboe:
 "This converts the io-wq workers to be forked off the tasks in question
  instead of being kernel threads that assume various bits of the
  original task identity.

  This kills > 400 lines of code from io_uring/io-wq, and it's the worst
  part of the code. We've had several bugs in this area, and the worry
  is always that we could be missing some pieces for file types doing
  unusual things (recent /dev/tty example comes to mind, userfaultfd
  reads installing file descriptors is another fun one... - both of
  which need special handling, and I bet it's not the last weird oddity
  we'll find).

  With these identical workers, we can have full confidence that we're
  never missing anything. That, in itself, is a huge win. Outside of
  that, it's also more efficient since we're not wasting space and code
  on tracking state, or switching between different states.

  I'm sure we're going to find little things to patch up after this
  series, but testing has been pretty thorough, from the usual
  regression suite to production. Any issue that may crop up should be
  manageable.

  There's also a nice series of further reductions we can do on top of
  this, but I wanted to get the meat of it out sooner rather than later.
  The general worry here isn't that it's fundamentally broken. Most of
  the little issues we've found over the last week have been related to
  just changes in how thread startup/exit is done, since that's the main
  difference between using kthreads and these kinds of threads. In fact,
  if all goes according to plan, I want to get this into the 5.10 and
  5.11 stable branches as well.

  That said, the changes outside of io_uring/io-wq are:

   - arch setup, simple one-liner to each arch copy_thread()
     implementation.

   - Removal of net and proc restrictions for io_uring, they are no
     longer needed or useful"

* tag 'io_uring-worker.v3-2021-02-25' of git://git.kernel.dk/linux-block: (30 commits)
  io-wq: remove now unused IO_WQ_BIT_ERROR
  io_uring: fix SQPOLL thread handling over exec
  io-wq: improve manager/worker handling over exec
  io_uring: ensure SQPOLL startup is triggered before error shutdown
  io-wq: make buffered file write hashed work map per-ctx
  io-wq: fix race around io_worker grabbing
  io-wq: fix races around manager/worker creation and task exit
  io_uring: ensure io-wq context is always destroyed for tasks
  arch: ensure parisc/powerpc handle PF_IO_WORKER in copy_thread()
  io_uring: cleanup ->user usage
  io-wq: remove nr_process accounting
  io_uring: flag new native workers with IORING_FEAT_NATIVE_WORKERS
  net: remove cmsg restriction from io_uring based send/recvmsg calls
  Revert "proc: don't allow async path resolution of /proc/self components"
  Revert "proc: don't allow async path resolution of /proc/thread-self components"
  io_uring: move SQPOLL thread io-wq forked worker
  io-wq: make io_wq_fork_thread() available to other users
  io-wq: only remove worker from free_list, if it was there
  io_uring: remove io_identity
  io_uring: remove any grabbing of context
  ...
2021-02-27 08:29:02 -08:00
..
alchemy driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
ar7 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
ath25 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
ath79 MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
bcm47xx MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
bcm63xx MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
bmips mips: bmips: init clocks earlier 2021-02-23 13:23:35 +01:00
boot - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
cavium-octeon - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
cobalt MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
configs Modules updates for v5.12 2021-02-23 10:15:33 -08:00
crypto crypto: {arm,arm64,mips}/poly1305 - remove redundant non-reduction from emit 2020-01-16 15:18:12 +08:00
dec MIPS: DEC: Restore bootmem reservation for firmware working memory area 2020-10-14 23:57:57 +02:00
fw MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
generic MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
include x86: 2021-02-21 13:31:43 -08:00
ingenic MIPS: jz4740: Rename jz4740 folders to ingenic 2020-09-18 16:35:05 +02:00
jazz MIPS: jazz: always allow little-endian builds 2021-01-22 13:53:21 +01:00
kernel io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
kvm KVM: MIPS: remove unneeded semicolon 2021-02-03 11:33:16 +01:00
lantiq MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
lib arch: mips: update references to current linux-mips list 2021-02-23 13:24:38 +01:00
loongson2ef - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
loongson32 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
loongson64 Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
math-emu MIPS: Use fallthrough for arch/mips 2020-05-07 11:55:47 +02:00
mm MIPS: make userspace mapping young by default 2021-02-26 09:41:05 -08:00
mti-malta driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
n64 mips: Add N64 machine type 2021-01-22 11:40:00 +01:00
net bpf: Rename BPF_XADD and prepare to encode other atomics in .imm 2021-01-14 18:34:29 -08:00
netlogic MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
pci driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
pic32 MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
pistachio driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
power mips: check for dsp presence only once before save/restore 2019-10-07 10:58:53 -07:00
ralink MIPS: ralink: manage low reset lines 2021-02-04 13:35:01 +01:00
rb532 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
sgi-ip22 MIPS: Only include the platform file needed 2020-05-13 00:17:18 +02:00
sgi-ip27 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
sgi-ip30 MIPS: SGI-IP30: Move irq bits to better header files 2020-09-21 22:15:49 +02:00
sgi-ip32 arch: mips: update references to current linux-mips list 2021-02-23 13:24:38 +01:00
sibyte MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
sni MIPS: SNI: Fix spurious interrupts 2020-09-16 22:40:58 +02:00
tools MIPS: tools: Fix resource leak in elf-entry.c 2020-05-24 09:29:48 +02:00
txx9 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
vdso Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
vr41xx MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
Kbuild MIPS: Fix "make clean" error due to recent changes 2020-05-13 13:20:22 +02:00
Kbuild.platforms mips: Add N64 machine type 2021-01-22 11:40:00 +01:00
Kconfig - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
Kconfig.debug mips: Add CPS_NS16550_WIDTH config 2020-05-22 09:12:52 +02:00
Makefile - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
Makefile.postlink MIPS: fix indentation of the 'RELOCS' message 2020-01-20 15:37:30 -08:00