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Make p1003_1b.aio_listio_max a tunable

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p1003_1b.aio_listio_max is now a tunable. Its value is reflected in the
sysctl of the same name, and the sysconf(3) variable _SC_AIO_LISTIO_MAX.
Its value will be bounded from below by the compile-time constant
AIO_LISTIO_MAX and from above by the compile-time constant
MAX_AIO_QUEUE_PER_PROC and the tunable vfs.aio.max_aio_queue.

Reviewed by:	jhb, kib
MFC after:	3 weeks
Relnotes:	yes
Sponsored by:	Spectra Logic Corp
Differential Revision:	https://reviews.freebsd.org/D11601
This commit is contained in:
Alan Somers 2017-08-08 16:14:31 +00:00
parent d0e75394cf
commit c45796d54e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=322258
2 changed files with 20 additions and 11 deletions
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1
sys/kern/posix4_mib.c
View File

@ -91,7 +91,6 @@ P1B_SYSCTL(CTL_P1003_1B_FSYNC, fsync);
P1B_SYSCTL(CTL_P1003_1B_SHARED_MEMORY_OBJECTS, shared_memory_objects);
P1B_SYSCTL(CTL_P1003_1B_SYNCHRONIZED_IO, synchronized_io);
P1B_SYSCTL(CTL_P1003_1B_TIMERS, timers);
P1B_SYSCTL(CTL_P1003_1B_AIO_LISTIO_MAX, aio_listio_max);
P1B_SYSCTL(CTL_P1003_1B_AIO_MAX, aio_max);
P1B_SYSCTL(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, aio_prio_delta_max);
P1B_SYSCTL(CTL_P1003_1B_DELAYTIMER_MAX, delaytimer_max);

30
sys/kern/vfs_aio.c
View File

@ -102,6 +102,7 @@ static uint64_t jobseqno;
#endif
FEATURE(aio, "Asynchronous I/O");
SYSCTL_DECL(_p1003_1b);
static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list");
@ -168,6 +169,11 @@ static int max_buf_aio = MAX_BUF_AIO;
SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
"Maximum buf aio requests per process (stored in the process)");
static int aio_listio_max = AIO_LISTIO_MAX;
SYSCTL_INT(_p1003_1b, CTL_P1003_1B_AIO_LISTIO_MAX, aio_listio_max,
CTLFLAG_RDTUN | CTLFLAG_CAPRD, &aio_listio_max, 0,
"Maximum aio requests for a single lio_listio call");
#ifdef COMPAT_FREEBSD6
typedef struct oaiocb {
int aio_fildes; /* File descriptor */
@ -388,6 +394,11 @@ static int
aio_onceonly(void)
{
if (aio_listio_max < AIO_LISTIO_MAX)
aio_listio_max = AIO_LISTIO_MAX;
if (aio_listio_max > MIN(MAX_AIO_QUEUE_PER_PROC, max_queue_count))
aio_listio_max = MIN(MAX_AIO_QUEUE_PER_PROC, max_queue_count);
exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
EVENTHANDLER_PRI_ANY);
exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec,
@ -405,14 +416,13 @@ aio_onceonly(void)
NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiocb_zone = uma_zcreate("AIOCB", sizeof(struct kaiocb), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiol_zone = uma_zcreate("AIOL", aio_listio_max * sizeof(intptr_t) ,
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiod_lifetime = AIOD_LIFETIME_DEFAULT;
jobrefid = 1;
p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO);
p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX);
p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
@ -1943,7 +1953,7 @@ sys_aio_suspend(struct thread *td, struct aio_suspend_args *uap)
struct aiocb **ujoblist;
int error;
if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
if (uap->nent < 0 || uap->nent > aio_listio_max)
return (EINVAL);
if (uap->timeout) {
@ -2151,7 +2161,7 @@ kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list,
if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT))
return (EINVAL);
if (nent < 0 || nent > AIO_LISTIO_MAX)
if (nent < 0 || nent > aio_listio_max)
return (EINVAL);
if (p->p_aioinfo == NULL)
@ -2283,7 +2293,7 @@ freebsd6_lio_listio(struct thread *td, struct freebsd6_lio_listio_args *uap)
return (EINVAL);
nent = uap->nent;
if (nent < 0 || nent > AIO_LISTIO_MAX)
if (nent < 0 || nent > aio_listio_max)
return (EINVAL);
if (uap->sig && (uap->mode == LIO_NOWAIT)) {
@ -2320,7 +2330,7 @@ sys_lio_listio(struct thread *td, struct lio_listio_args *uap)
return (EINVAL);
nent = uap->nent;
if (nent < 0 || nent > AIO_LISTIO_MAX)
if (nent < 0 || nent > aio_listio_max)
return (EINVAL);
if (uap->sig && (uap->mode == LIO_NOWAIT)) {
@ -2789,7 +2799,7 @@ freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap)
uint32_t *ujoblist32;
int error, i;
if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
if (uap->nent < 0 || uap->nent > aio_listio_max)
return (EINVAL);
if (uap->timeout) {
@ -2915,7 +2925,7 @@ freebsd6_freebsd32_lio_listio(struct thread *td,
return (EINVAL);
nent = uap->nent;
if (nent < 0 || nent > AIO_LISTIO_MAX)
if (nent < 0 || nent > aio_listio_max)
return (EINVAL);
if (uap->sig && (uap->mode == LIO_NOWAIT)) {
@ -2961,7 +2971,7 @@ freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap)
return (EINVAL);
nent = uap->nent;
if (nent < 0 || nent > AIO_LISTIO_MAX)
if (nent < 0 || nent > aio_listio_max)
return (EINVAL);
if (uap->sig && (uap->mode == LIO_NOWAIT)) {