| Age | Commit message (Collapse) | Author |
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Add the static napi tracking strategy. That allows the user to manually
manage the napi ids list for busy polling, and eliminate the overhead of
dynamically updating the list from the fast path.
Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/96943de14968c35a5c599352259ad98f3c0770ba.1728828877.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Rather than store the task_struct itself in struct io_kiocb, store
the io_uring specific task_struct. The life times are the same in terms
of io_uring, and this avoids doing some dereferences through the
task_struct. For the hot path of putting local task references, we can
deref req->tctx instead, which we'll need anyway in that function
regardless of whether it's local or remote references.
This is mostly straight forward, except the original task PF_EXITING
check needs a bit of tweaking. task_work is _always_ run from the
originating task, except in the fallback case, where it's run from a
kernel thread. Replace the potentially racy (in case of fallback work)
checks for req->task->flags with current->flags. It's either the still
the original task, in which case PF_EXITING will be sane, or it has
PF_KTHREAD set, in which case it's fallback work. Both cases should
prevent moving forward with the given request.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The empty node was used as a placeholder for a sparse entry, but it
didn't really solve any issues. The caller still has to check for
whether it's the empty node or not, it may as well just check for a NULL
return instead.
The dummy_ubuf was used for a sparse buffer entry, but NULL will serve
the same purpose there of ensuring an -EFAULT on attempted import.
Just use NULL for a sparse node, regardless of whether or not it's a
file or buffer resource.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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It's only used in fdinfo, nothing really gained from having this helper.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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For files, there's nr_user_files/file_table/file_data, and buffers have
nr_user_bufs/user_bufs/buf_data. There's no reason why file_table and
file_data can't be the same thing, and ditto for the buffer side. That
gets rid of more io_ring_ctx state that's in two spots rather than just
being in one spot, as it should be. Put all the registered file data in
one locations, and ditto on the buffer front.
This also avoids having both io_rsrc_data->nodes being an allocated
array, and ->user_bufs[] or ->file_table.nodes. There's no reason to
have this information duplicated. Keep it in one spot, io_rsrc_data,
along with how many resources are available.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Work in progress, but get rid of the per-ring serialization of resource
nodes, like registered buffers and files. Main issue here is that one
node can otherwise hold up a bunch of other nodes from getting freed,
which is especially a problem for file resource nodes and networked
workloads where some descriptors may not see activity in a long time.
As an example, instantiate an io_uring ring fd and create a sparse
registered file table. Even 2 will do. Then create a socket and register
it as fixed file 0, F0. The number of open files in the app is now 5,
with 0/1/2 being the usual stdin/out/err, 3 being the ring fd, and 4
being the socket. Register this socket (eg "the listener") in slot 0 of
the registered file table. Now add an operation on the socket that uses
slot 0. Finally, loop N times, where each loop creates a new socket,
registers said socket as a file, then unregisters the socket, and
finally closes the socket. This is roughly similar to what a basic
accept loop would look like.
At the end of this loop, it's not unreasonable to expect that there
would still be 5 open files. Each socket created and registered in the
loop is also unregistered and closed. But since the listener socket
registered first still has references to its resource node due to still
being active, each subsequent socket unregistration is stuck behind it
for reclaim. Hence 5 + N files are still open at that point, where N is
awaiting the final put held up by the listener socket.
Rewrite the io_rsrc_node handling to NOT rely on serialization. Struct
io_kiocb now gets explicit resource nodes assigned, with each holding a
reference to the parent node. A parent node is either of type FILE or
BUFFER, which are the two types of nodes that exist. A request can have
two nodes assigned, if it's using both registered files and buffers.
Since request issue and task_work completion is both under the ring
private lock, no atomics are needed to handle these references. It's a
simple unlocked inc/dec. As before, the registered buffer or file table
each hold a reference as well to the registered nodes. Final put of the
node will remove the node and free the underlying resource, eg unmap the
buffer or put the file.
Outside of removing the stall in resource reclaim described above, it
has the following advantages:
1) It's a lot simpler than the previous scheme, and easier to follow.
No need to specific quiesce handling anymore.
2) There are no resource node allocations in the fast path, all of that
happens at resource registration time.
3) The structs related to resource handling can all get simplified
quite a bit, like io_rsrc_node and io_rsrc_data. io_rsrc_put can
go away completely.
4) Handling of resource tags is much simpler, and doesn't require
persistent storage as it can simply get assigned up front at
registration time. Just copy them in one-by-one at registration time
and assign to the resource node.
The only real downside is that a request is now explicitly limited to
pinning 2 resources, one file and one buffer, where before just
assigning a resource node to a request would pin all of them. The upside
is that it's easier to follow now, as an individual resource is
explicitly referenced and assigned to the request.
With this in place, the above mentioned example will be using exactly 5
files at the end of the loop, not N.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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io_uring maintains two hash lists of inflight requests:
1) ctx->cancel_table_locked. This is used when the caller has the
ctx->uring_lock held already. This is only an issue side parameter,
as removal or task_work will always have it held.
2) ctx->cancel_table. This is used when the issuer does NOT have the
ctx->uring_lock held, and relies on the table spinlocks for access.
However, it's pretty trivial to simply grab the lock in the one spot
where we care about it, for insertion. With that, we can kill the
unlocked table (and get rid of the _locked postfix for the other one).
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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If we change it to tracking ubuf->start + ubuf->len, then we can reduce
the size of struct io_mapped_ubuf by another 4 bytes, effectively 8
bytes, as a hole is eliminated too.
This shrinks io_mapped_ubuf to 32 bytes.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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This info may be useful when attempting to debug a problem involving a
ring using the NAPI feature.
Here is an example of the output:
ip-172-31-39-89 /proc/772/fdinfo # cat 14
pos: 0
flags: 02000002
mnt_id: 16
ino: 10243
SqMask: 0xff
SqHead: 633
SqTail: 633
CachedSqHead: 633
CqMask: 0x3fff
CqHead: 430250
CqTail: 430250
CachedCqTail: 430250
SQEs: 0
CQEs: 0
SqThread: 885
SqThreadCpu: 0
SqTotalTime: 52793826
SqWorkTime: 3590465
UserFiles: 0
UserBufs: 0
PollList:
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=6, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=6, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
op=10, task_works=0
CqOverflowList:
NAPI: enabled
napi_busy_poll_to: 1
napi_prefer_busy_poll: true
Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/bb184f8b62703ddd3e6e19eae7ab6c67b97e1e10.1722293317.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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There are a few of those:
io_uring/fdinfo.c:170:16: warning: declaration shadows a local variable [-Wshadow]
170 | struct file *f = io_file_from_index(&ctx->file_table, i);
| ^
io_uring/fdinfo.c:53:67: note: previous declaration is here
53 | __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
| ^
io_uring/cancel.c:187:25: warning: declaration shadows a local variable [-Wshadow]
187 | struct io_uring_task *tctx = node->task->io_uring;
| ^
io_uring/cancel.c:166:31: note: previous declaration is here
166 | struct io_uring_task *tctx,
| ^
io_uring/register.c:371:25: warning: declaration shadows a local variable [-Wshadow]
371 | struct io_uring_task *tctx = node->task->io_uring;
| ^
io_uring/register.c:312:24: note: previous declaration is here
312 | struct io_uring_task *tctx = NULL;
| ^
and a simple cleanup gets rid of them. For the fdinfo case, make a
distinction between the file being passed in (for the ring), and the
registered files we iterate. For the other two cases, just get rid of
shadowed variable, there's no reason to have a new one.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Commit 3fcb9d17206e ("io_uring/sqpoll: statistics of the true
utilization of sq threads"), currently in Jens for-next branch, peeks at
io_sq_data->thread to report utilization statistics. But, If
io_uring_show_fdinfo races with sqpoll terminating, even though we hold
the ctx lock, sqd->thread might be NULL and we hit the Oops below.
Note that we could technically just protect the getrusage() call and the
sq total/work time calculations. But showing some sq
information (pid/cpu) and not other information (utilization) is more
confusing than not reporting anything, IMO. So let's hide it all if we
happen to race with a dying sqpoll.
This can be triggered consistently in my vm setup running
sqpoll-cancel-hang.t in a loop.
BUG: kernel NULL pointer dereference, address: 00000000000007b0
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 0 PID: 16587 Comm: systemd-coredum Not tainted 6.8.0-rc3-g3fcb9d17206e-dirty #69
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 2/2/2022
RIP: 0010:getrusage+0x21/0x3e0
Code: 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 d1 48 89 e5 41 57 41 56 41 55 41 54 49 89 fe 41 52 53 48 89 d3 48 83 ec 30 <4c> 8b a7 b0 07 00 00 48 8d 7a 08 65 48 8b 04 25 28 00 00 00 48 89
RSP: 0018:ffffa166c671bb80 EFLAGS: 00010282
RAX: 00000000000040ca RBX: ffffa166c671bc60 RCX: ffffa166c671bc60
RDX: ffffa166c671bc60 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffa166c671bbe0 R08: ffff9448cc3930c0 R09: 0000000000000000
R10: ffffa166c671bd50 R11: ffffffff9ee89260 R12: 0000000000000000
R13: ffff9448ce099480 R14: 0000000000000000 R15: ffff9448cff5b000
FS: 00007f786e225900(0000) GS:ffff94493bc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000007b0 CR3: 000000010d39c000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
<TASK>
? __die_body+0x1a/0x60
? page_fault_oops+0x154/0x440
? srso_alias_return_thunk+0x5/0xfbef5
? do_user_addr_fault+0x174/0x7c0
? srso_alias_return_thunk+0x5/0xfbef5
? exc_page_fault+0x63/0x140
? asm_exc_page_fault+0x22/0x30
? getrusage+0x21/0x3e0
? seq_printf+0x4e/0x70
io_uring_show_fdinfo+0x9db/0xa10
? srso_alias_return_thunk+0x5/0xfbef5
? vsnprintf+0x101/0x4d0
? srso_alias_return_thunk+0x5/0xfbef5
? seq_vprintf+0x34/0x50
? srso_alias_return_thunk+0x5/0xfbef5
? seq_printf+0x4e/0x70
? seq_show+0x16b/0x1d0
? __pfx_io_uring_show_fdinfo+0x10/0x10
seq_show+0x16b/0x1d0
seq_read_iter+0xd7/0x440
seq_read+0x102/0x140
vfs_read+0xae/0x320
? srso_alias_return_thunk+0x5/0xfbef5
? __do_sys_newfstat+0x35/0x60
ksys_read+0xa5/0xe0
do_syscall_64+0x50/0x110
entry_SYSCALL_64_after_hwframe+0x6e/0x76
RIP: 0033:0x7f786ec1db4d
Code: e8 46 e3 01 00 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 80 3d d9 ce 0e 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffcb361a4b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000055a4c8fe42f0 RCX: 00007f786ec1db4d
RDX: 0000000000000400 RSI: 000055a4c8fe48a0 RDI: 0000000000000006
RBP: 00007f786ecfb0b0 R08: 00007f786ecfb2a8 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f786ecfaf60
R13: 000055a4c8fe42f0 R14: 0000000000000000 R15: 00007ffcb361a628
</TASK>
Modules linked in:
CR2: 00000000000007b0
---[ end trace 0000000000000000 ]---
RIP: 0010:getrusage+0x21/0x3e0
Code: 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 d1 48 89 e5 41 57 41 56 41 55 41 54 49 89 fe 41 52 53 48 89 d3 48 83 ec 30 <4c> 8b a7 b0 07 00 00 48 8d 7a 08 65 48 8b 04 25 28 00 00 00 48 89
RSP: 0018:ffffa166c671bb80 EFLAGS: 00010282
RAX: 00000000000040ca RBX: ffffa166c671bc60 RCX: ffffa166c671bc60
RDX: ffffa166c671bc60 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffa166c671bbe0 R08: ffff9448cc3930c0 R09: 0000000000000000
R10: ffffa166c671bd50 R11: ffffffff9ee89260 R12: 0000000000000000
R13: ffff9448ce099480 R14: 0000000000000000 R15: ffff9448cff5b000
FS: 00007f786e225900(0000) GS:ffff94493bc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000007b0 CR3: 000000010d39c000 CR4: 0000000000750ef0
PKRU: 55555554
Kernel panic - not syncing: Fatal exception
Kernel Offset: 0x1ce00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Fixes: 3fcb9d17206e ("io_uring/sqpoll: statistics of the true utilization of sq threads")
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20240309003256.358-1-krisman@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Count the running time and actual IO processing time of the sqpoll
thread, and output the statistical data to fdinfo.
Variable description:
"work_time" in the code represents the sum of the jiffies of the sq
thread actually processing IO, that is, how many milliseconds it
actually takes to process IO. "total_time" represents the total time
that the sq thread has elapsed from the beginning of the loop to the
current time point, that is, how many milliseconds it has spent in
total.
The test tool is fio, and its parameters are as follows:
[global]
ioengine=io_uring
direct=1
group_reporting
bs=128k
norandommap=1
randrepeat=0
refill_buffers
ramp_time=30s
time_based
runtime=1m
clocksource=clock_gettime
overwrite=1
log_avg_msec=1000
numjobs=1
[disk0]
filename=/dev/nvme0n1
rw=read
iodepth=16
hipri
sqthread_poll=1
The test results are as follows:
Every 2.0s: cat /proc/9230/fdinfo/6 | grep -E Sq
SqMask: 0x3
SqHead: 3197153
SqTail: 3197153
CachedSqHead: 3197153
SqThread: 9231
SqThreadCpu: 11
SqTotalTime: 18099614
SqWorkTime: 16748316
The test results corresponding to different iodepths are as follows:
|-----------|-------|-------|-------|------|-------|
| iodepth | 1 | 4 | 8 | 16 | 64 |
|-----------|-------|-------|-------|------|-------|
|utilization| 2.9% | 8.8% | 10.9% | 92.9%| 84.4% |
|-----------|-------|-------|-------|------|-------|
| idle | 97.1% | 91.2% | 89.1% | 7.1% | 15.6% |
|-----------|-------|-------|-------|------|-------|
Signed-off-by: Xiaobing Li <xiaobing.li@samsung.com>
Link: https://lore.kernel.org/r/20240228091251.543383-1-xiaobing.li@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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A previous commit added a trylock for getting the SQPOLL thread info via
fdinfo, but this introduced a regression where we often fail to get it if
the thread is busy. For that case, we end up not printing the current CPU
and PID info.
Rather than rely on this lock, just print the pid we already stored in
the io_sq_data struct, and ensure we update the current CPU every time
we've slept or potentially rescheduled. The latter won't potentially be
100% accurate, but that wasn't the case before either as the task can
get migrated at any time unless it has been pinned at creation time.
We retain keeping the io_sq_data dereference inside the ctx->uring_lock,
as it has always been, as destruction of the thread and data happen below
that. We could make this RCU safe, but there's little point in doing that.
With this, we always print the last valid information we had, rather than
have spurious outputs with missing information.
Fixes: 7644b1a1c9a7 ("io_uring/fdinfo: lock SQ thread while retrieving thread cpu/pid")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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We could race with SQ thread exit, and if we do, we'll hit a NULL pointer
dereference when the thread is cleared. Grab the SQPOLL data lock before
attempting to get the task cpu and pid for fdinfo, this ensures we have a
stable view of it.
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218032
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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If a ring is setup with IORING_SETUP_NO_SQARRAY, then we don't have
the SQ array. Don't try to dump info from it through fdinfo if that
is the case.
Reported-by: syzbot+216e2ea6e0bf4a0acdd7@syzkaller.appspotmail.com
Fixes: 2af89abda7d9 ("io_uring: add option to remove SQ indirection")
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The caller holds a reference to the ring itself, so by definition
the ring cannot go away. There's no need to play games with tryget
for the reference, as we don't need an extra reference at all.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Back in 2008 we extended the capability bits from 32 to 64, and we did
it by extending the single 32-bit capability word from one word to an
array of two words. It was then obfuscated by hiding the "2" behind two
macro expansions, with the reasoning being that maybe it gets extended
further some day.
That reasoning may have been valid at the time, but the last thing we
want to do is to extend the capability set any more. And the array of
values not only causes source code oddities (with loops to deal with
it), but also results in worse code generation. It's a lose-lose
situation.
So just change the 'u32[2]' into a 'u64' and be done with it.
We still have to deal with the fact that the user space interface is
designed around an array of these 32-bit values, but that was the case
before too, since the array layouts were different (ie user space
doesn't use an array of 32-bit values for individual capability masks,
but an array of 32-bit slices of multiple masks).
So that marshalling of data is actually simplified too, even if it does
remain somewhat obscure and odd.
This was all triggered by my reaction to the new "cap_isidentical()"
introduced recently. By just using a saner data structure, it went from
unsigned __capi;
CAP_FOR_EACH_U32(__capi) {
if (a.cap[__capi] != b.cap[__capi])
return false;
}
return true;
to just being
return a.val == b.val;
instead. Which is rather more obvious both to humans and to compilers.
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: Serge Hallyn <serge@hallyn.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Paul Moore <paul@paul-moore.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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A previous commit split the hash table for polled requests into two
parts, but didn't get the fdinfo output updated. This means that it's
less useful for debugging, as we may think a given request is not pending
poll.
Fix this up by dumping the locked hash table contents too.
Fixes: 9ca9fb24d5fe ("io_uring: mutex locked poll hashing")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Only with the big sqe feature they take 128 bytes per entry, but we
unconditionally advance by 128B. Fix it by using sq_shift.
Fixes: 3b8fdd1dc35e3 ("io_uring/fdinfo: fix sqe dumping for IORING_SETUP_SQE128")
Reported-and-tested-by: syzbot+e5198737e8a2d23d958c@syzkaller.appspotmail.com
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8b41287cb75d5efb8fcb5cccde845ddbbadd8372.1665449983.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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If we have doubly sized SQEs, then we need to shift the sq index by 1
to account for using two entries for a single request. The CQE dumping
gets this right, but the SQE one does not.
Improve the SQE dumping in general, the information dumped is pretty
sparse and doesn't even cover the whole basic part of the SQE. Include
information on the extended part of the SQE, if doubly sized SQEs are
in use. A typical dump now looks like the following:
[...]
SQEs: 32
32: opcode:URING_CMD, fd:0, flags:1, off:3225964160, addr:0x0, rw_flags:0x0, buf_index:0 user_data:2721, e0:0x0, e1:0xffffb8041000, e2:0x100000000000, e3:0x5500, e4:0x7, e5:0x0, e6:0x0, e7:0x0
33: opcode:URING_CMD, fd:0, flags:1, off:3225964160, addr:0x0, rw_flags:0x0, buf_index:0 user_data:2722, e0:0x0, e1:0xffffb8043000, e2:0x100000000000, e3:0x5508, e4:0x7, e5:0x0, e6:0x0, e7:0x0
34: opcode:URING_CMD, fd:0, flags:1, off:3225964160, addr:0x0, rw_flags:0x0, buf_index:0 user_data:2723, e0:0x0, e1:0xffffb8045000, e2:0x100000000000, e3:0x5510, e4:0x7, e5:0x0, e6:0x0, e7:0x0
[...]
Fixes: ebdeb7c01d02 ("io_uring: add support for 128-byte SQEs")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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We already have the cq_shift, just use that to tell if we have doubly
sized CQEs or not.
While in there, cleanup the CQE32 vs normal CQE size printing.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Commit 3a3d47fa9cfd ("io_uring: make io_uring_types.h public") moved
a bunch of io_uring types to a kernel wide header, so we could make
tracing a bit saner rather than pass in a ton of arguments.
However, there are a few types in there that are not really needed to
be system wide. Move the cancel data and mapped buffers back to the
appropriate io_uring local headers.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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io_uring/io_uring.h already includes io_uring_types.h, no need to
include it every time. Kill it in a bunch of places, it prepares us for
following patches.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/94d8c943fbe0ef949981c508ddcee7fc1c18850f.1655384063.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Instead of passing around a pointer to hash buckets, add a bit of type
safety and wrap it into a structure.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d65bc3faba537ec2aca9eabf334394936d44bd28.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Add a new io_hash_bucket structure so that each bucket in cancel_hash
has separate spinlock. Use per entry lock for cancel_hash, this removes
some completion lock invocation and remove contension between different
cancel_hash entries.
Signed-off-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/05d1e135b0c8bce9d1441e6346776589e5783e26.1655371007.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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This also means moving a bit more of the fixed file handling to the
filetable side, which makes sense separately too.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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