lkml.org 
[lkml]   [2019]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V2] io_uring: introduce inline reqs for IORING_SETUP_IOPOLL
On Tue, Apr 09, 2019 at 01:21:54PM +0800, Jianchao Wang wrote:
> For the IORING_SETUP_IOPOLL case, all of the submission and
> completion are handled under ctx->uring_lock or in SQ poll thread
> context, so io_get_req and io_put_req has been serialized well.
> The only exception is the asynchronous workqueue context where could
> free the io_kiocb for error. To overcome this, we allocate a new
> io_kiocb and free the previous inlined one.
>
> Based on this, we introduce the preallocated reqs list per ctx and
> needn't to provide any lock to serialize the updating of list. The
> performacne benefits from this. The test result of following fio
> command

I really don't like the idea of exposing this to userspace. Is
there any good reason to not simply always allocate inline request
up to a certain ring size?

\
 
 \ /
  Last update: 2019-04-09 11:38    [W:0.047 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site