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io-wq: provide IO_WQ_* constants for IORING_REGISTER_IOWQ_MAX_WORKERS arg items

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The items passed in the array pointed by the arg parameter
of IORING_REGISTER_IOWQ_MAX_WORKERS io_uring_register operation
carry certain semantics: they refer to different io-wq worker categories;
provide IO_WQ_* constants in the UAPI, so these categories can be referenced
in the user space code.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Complements: 2e480058dd ("io-wq: provide a way to limit max number of workers")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Link: https://lore.kernel.org/r/20210913154415.GA12890@asgard.redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Eugene Syromiatnikov 2021-09-13 17:44:15 +02:00 committed by Jens Axboe
parent 767a65e9f3
commit dd47c10453
2 changed files with 12 additions and 1 deletions
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5
fs/io-wq.c
View file

@ -14,6 +14,7 @@
#include <linux/rculist_nulls.h>
#include <linux/cpu.h>
#include <linux/tracehook.h>
#include <uapi/linux/io_uring.h>
#include "io-wq.h"
@ -1281,6 +1282,10 @@ int io_wq_max_workers(struct io_wq *wq, int *new_count)
{
int i, node, prev = 0;
BUILD_BUG_ON((int) IO_WQ_ACCT_BOUND != (int) IO_WQ_BOUND);
BUILD_BUG_ON((int) IO_WQ_ACCT_UNBOUND != (int) IO_WQ_UNBOUND);
BUILD_BUG_ON((int) IO_WQ_ACCT_NR != 2);
for (i = 0; i < 2; i++) {
if (new_count[i] > task_rlimit(current, RLIMIT_NPROC))
new_count[i] = task_rlimit(current, RLIMIT_NPROC);

8
include/uapi/linux/io_uring.h
View file

@ -317,13 +317,19 @@ enum {
IORING_REGISTER_IOWQ_AFF = 17,
IORING_UNREGISTER_IOWQ_AFF = 18,
/* set/get max number of workers */
/* set/get max number of io-wq workers */
IORING_REGISTER_IOWQ_MAX_WORKERS = 19,
/* this goes last */
IORING_REGISTER_LAST
};
/* io-wq worker categories */
enum {
IO_WQ_BOUND,
IO_WQ_UNBOUND,
};
/* deprecated, see struct io_uring_rsrc_update */
struct io_uring_files_update {
__u32 offset;