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Add sysctl vm.md_malloc_wait, non-zero value of which switches malloc-backed

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md(4) to using M_WAITOK malloc calls.

M_NOWAITOK allocations may fail when enough memory could be freed, but not
immediately. E.g. SU UFS becomes quite unhappy when metadata write return
error, that would happen for failed malloc() call.

Reported and tested by:	pho
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2010-12-29 11:39:15 +00:00
parent abf6c181e4
commit c44d423ed8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216793
1 changed files with 8 additions and 3 deletions
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11
sys/dev/md/md.c
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@ -103,6 +103,8 @@ static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors");
static int md_debug;
SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
static int md_malloc_wait;
SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, "");
#if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
/*
@ -208,11 +210,12 @@ new_indir(u_int shift)
{
struct indir *ip;
ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO);
ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT)
| M_ZERO);
if (ip == NULL)
return (NULL);
ip->array = malloc(sizeof(uintptr_t) * NINDIR,
M_MDSECT, M_NOWAIT | M_ZERO);
M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO);
if (ip->array == NULL) {
free(ip, M_MD);
return (NULL);
@ -456,6 +459,7 @@ mdstart_malloc(struct md_s *sc, struct bio *bp)
} else {
if (osp <= 255) {
sp = (uintptr_t)uma_zalloc(sc->uma,
md_malloc_wait ? M_WAITOK :
M_NOWAIT);
if (sp == 0) {
error = ENOSPC;
@ -850,7 +854,8 @@ mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio)
nsectors = sc->mediasize / sc->sectorsize;
for (u = 0; u < nsectors; u++) {
sp = (uintptr_t)uma_zalloc(sc->uma, M_NOWAIT | M_ZERO);
sp = (uintptr_t)uma_zalloc(sc->uma, md_malloc_wait ?
M_WAITOK : M_NOWAIT | M_ZERO);
if (sp != 0)
error = s_write(sc->indir, u, sp);
else