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Index: sys/kern/kern_resource.c
===================================================================
--- sys/kern/kern_resource.c
+++ sys/kern/kern_resource.c
@@ -1276,7 +1276,6 @@
racct_create(&new_uip->ui_racct);
refcount_init(&new_uip->ui_ref, 1);
new_uip->ui_uid = uid;
- mtx_init(&new_uip->ui_vmsize_mtx, "ui_vmsize", NULL, MTX_DEF);
rw_wlock(&uihashtbl_lock);
/*
@@ -1291,7 +1290,6 @@
} else {
rw_wunlock(&uihashtbl_lock);
racct_destroy(&new_uip->ui_racct);
- mtx_destroy(&new_uip->ui_vmsize_mtx);
free(new_uip, M_UIDINFO);
}
return (uip);
@@ -1352,7 +1350,6 @@
if (uip->ui_vmsize != 0)
printf("freeing uidinfo: uid = %d, swapuse = %lld\n",
uip->ui_uid, (unsigned long long)uip->ui_vmsize);
- mtx_destroy(&uip->ui_vmsize_mtx);
free(uip, M_UIDINFO);
}
Index: sys/sys/resourcevar.h
===================================================================
--- sys/sys/resourcevar.h
+++ sys/sys/resourcevar.h
@@ -93,12 +93,10 @@
* (a) Constant from inception
* (b) Lockless, updated using atomics
* (c) Locked by global uihashtbl_lock
- * (d) Locked by the ui_vmsize_mtx
*/
struct uidinfo {
LIST_ENTRY(uidinfo) ui_hash; /* (c) hash chain of uidinfos */
- struct mtx ui_vmsize_mtx;
- vm_ooffset_t ui_vmsize; /* (d) swap reservation by uid */
+ unsigned long ui_vmsize; /* (b) pages of swap reservation by uid */
long ui_sbsize; /* (b) socket buffer space consumed */
long ui_proccnt; /* (b) number of processes */
long ui_ptscnt; /* (b) number of pseudo-terminals */
Index: sys/vm/swap_pager.c
===================================================================
--- sys/vm/swap_pager.c
+++ sys/vm/swap_pager.c
@@ -151,12 +151,17 @@
int swap_pager_avail;
static struct sx swdev_syscall_lock; /* serialize swap(on|off) */
-static vm_ooffset_t swap_total;
-SYSCTL_QUAD(_vm, OID_AUTO, swap_total, CTLFLAG_RD, &swap_total, 0,
- "Total amount of available swap storage.");
-static vm_ooffset_t swap_reserved;
-SYSCTL_QUAD(_vm, OID_AUTO, swap_reserved, CTLFLAG_RD, &swap_reserved, 0,
+static unsigned long swap_reserved;
+static unsigned long swap_total;
+static int sysctl_swap_reserved(SYSCTL_HANDLER_ARGS);
+SYSCTL_PROC(_vm, OID_AUTO, swap_reserved, CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ NULL, 0, sysctl_swap_reserved, "A",
"Amount of swap storage needed to back all allocated anonymous memory.");
+static int sysctl_swap_total(SYSCTL_HANDLER_ARGS);
+SYSCTL_PROC(_vm, OID_AUTO, swap_total, CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ NULL, 0, sysctl_swap_total, "A",
+ "Total amount of available swap storage.");
+
static int overcommit = 0;
SYSCTL_INT(_vm, VM_OVERCOMMIT, overcommit, CTLFLAG_RW, &overcommit, 0,
"Configure virtual memory overcommit behavior. See tuning(7) "
@@ -173,6 +178,24 @@
#define SWAP_RESERVE_RLIMIT_ON (1 << 1)
#define SWAP_RESERVE_ALLOW_NONWIRED (1 << 2)
+static int
+sysctl_swap_total(SYSCTL_HANDLER_ARGS)
+{
+ uint64_t val;
+
+ val = swap_total << PAGE_SHIFT;
+ return (sysctl_handle_64(oidp, &val, 0, req));
+}
+
+static int
+sysctl_swap_reserved(SYSCTL_HANDLER_ARGS)
+{
+ uint64_t val;
+
+ val = swap_reserved << PAGE_SHIFT;
+ return (sysctl_handle_64(oidp, &val, 0, req));
+}
+
int
swap_reserve(vm_ooffset_t incr)
{
@@ -184,6 +207,7 @@
swap_reserve_by_cred(vm_ooffset_t incr, struct ucred *cred)
{
vm_ooffset_t r, s;
+ unsigned long prev;
int res, error;
static int curfail;
static struct timeval lastfail;
@@ -191,9 +215,8 @@
uip = cred->cr_ruidinfo;
- if (incr & PAGE_MASK)
- panic("swap_reserve: & PAGE_MASK");
-
+ KASSERT((incr & PAGE_MASK) == 0, ("swap_reserve: decr: %ju & PAGE_MASK", (uintmax_t)incr));
+
#ifdef RACCT
if (racct_enable) {
PROC_LOCK(curproc);
@@ -204,9 +227,10 @@
}
#endif
+ incr >>= PAGE_SHIFT;
res = 0;
- mtx_lock(&sw_dev_mtx);
- r = swap_reserved + incr;
+ prev = atomic_fetchadd_long(&swap_reserved, incr);
+ r = prev + incr;
if (overcommit & SWAP_RESERVE_ALLOW_NONWIRED) {
s = vm_cnt.v_page_count - vm_cnt.v_free_reserved -
vm_wire_count();
@@ -217,34 +241,27 @@
if ((overcommit & SWAP_RESERVE_FORCE_ON) == 0 || r <= s ||
(error = priv_check(curthread, PRIV_VM_SWAP_NOQUOTA)) == 0) {
res = 1;
- swap_reserved = r;
- }
- mtx_unlock(&sw_dev_mtx);
+ } else
+ atomic_subtract_long(&swap_reserved, incr);
if (res) {
- UIDINFO_VMSIZE_LOCK(uip);
+ prev = atomic_fetchadd_long(&uip->ui_vmsize, incr);
if ((overcommit & SWAP_RESERVE_RLIMIT_ON) != 0 &&
- uip->ui_vmsize + incr > lim_cur(curthread, RLIMIT_SWAP) &&
- priv_check(curthread, PRIV_VM_SWAP_NORLIMIT))
+ prev + incr > lim_cur(curthread, RLIMIT_SWAP) &&
+ priv_check(curthread, PRIV_VM_SWAP_NORLIMIT)) {
res = 0;
- else
- uip->ui_vmsize += incr;
- UIDINFO_VMSIZE_UNLOCK(uip);
- if (!res) {
- mtx_lock(&sw_dev_mtx);
- swap_reserved -= incr;
- mtx_unlock(&sw_dev_mtx);
+ atomic_subtract_long(&uip->ui_vmsize, incr);
}
}
if (!res && ppsratecheck(&lastfail, &curfail, 1)) {
printf("uid %d, pid %d: swap reservation for %jd bytes failed\n",
- uip->ui_uid, curproc->p_pid, incr);
+ uip->ui_uid, curproc->p_pid, (uintmax_t)incr);
}
#ifdef RACCT
- if (!res) {
+ if (racct_enable && !res) {
PROC_LOCK(curproc);
- racct_sub(curproc, RACCT_SWAP, incr);
+ racct_sub(curproc, RACCT_SWAP, incr << PAGE_SHIFT);
PROC_UNLOCK(curproc);
}
#endif
@@ -257,21 +274,20 @@
{
struct uidinfo *uip;
- mtx_lock(&sw_dev_mtx);
- swap_reserved += incr;
- mtx_unlock(&sw_dev_mtx);
+ KASSERT((incr & PAGE_MASK) == 0, ("swap_reserve: decr: %ju & PAGE_MASK", (uintmax_t)incr));
#ifdef RACCT
- PROC_LOCK(curproc);
- racct_add_force(curproc, RACCT_SWAP, incr);
- PROC_UNLOCK(curproc);
+ if (racct_enable) {
+ PROC_LOCK(curproc);
+ racct_add_force(curproc, RACCT_SWAP, incr);
+ PROC_UNLOCK(curproc);
+ }
#endif
-
- uip = curthread->td_ucred->cr_ruidinfo;
+ incr >>= PAGE_SHIFT;
+ atomic_add_long(&swap_reserved, incr);
PROC_LOCK(curproc);
- UIDINFO_VMSIZE_LOCK(uip);
- uip->ui_vmsize += incr;
- UIDINFO_VMSIZE_UNLOCK(uip);
+ uip = curproc->p_ucred->cr_ruidinfo;
+ atomic_add_long(&uip->ui_vmsize, incr);
PROC_UNLOCK(curproc);
}
@@ -281,7 +297,7 @@
struct ucred *cred;
PROC_LOCK(curproc);
- cred = curthread->td_ucred;
+ cred = curproc->p_ucred;
swap_release_by_cred(decr, cred);
PROC_UNLOCK(curproc);
}
@@ -289,26 +305,23 @@
void
swap_release_by_cred(vm_ooffset_t decr, struct ucred *cred)
{
+ unsigned long prev;
struct uidinfo *uip;
uip = cred->cr_ruidinfo;
- if (decr & PAGE_MASK)
- panic("swap_release: & PAGE_MASK");
+ KASSERT((decr & PAGE_MASK) == 0, ("swap_reserve: decr: %ju & PAGE_MASK", (uintmax_t)decr));
- mtx_lock(&sw_dev_mtx);
- if (swap_reserved < decr)
+ decr >>= PAGE_SHIFT;
+ prev = atomic_fetchadd_long(&swap_reserved, -decr);
+ if (prev < decr)
panic("swap_reserved < decr");
- swap_reserved -= decr;
- mtx_unlock(&sw_dev_mtx);
- UIDINFO_VMSIZE_LOCK(uip);
- if (uip->ui_vmsize < decr)
+ prev = atomic_fetchadd_long(&uip->ui_vmsize, -decr);
+ if (prev < decr)
printf("negative vmsize for uid = %d\n", uip->ui_uid);
- uip->ui_vmsize -= decr;
- UIDINFO_VMSIZE_UNLOCK(uip);
-
- racct_sub_cred(cred, RACCT_SWAP, decr);
+ if (racct_enable)
+ racct_sub_cred(cred, RACCT_SWAP, decr << PAGE_SHIFT);
}
#define SWM_POP 0x01 /* pop out */
@@ -2176,7 +2189,7 @@
{
unsigned long maxpages, npages;
- npages = swap_total / PAGE_SIZE;
+ npages = swap_total;
/* absolute maximum we can handle assuming 100% efficiency */
maxpages = uma_zone_get_max(swblk_zone) * SWAP_META_PAGES;
@@ -2254,7 +2267,7 @@
TAILQ_INSERT_TAIL(&swtailq, sp, sw_list);
nswapdev++;
swap_pager_avail += nblks - 2;
- swap_total += (vm_ooffset_t)nblks * PAGE_SIZE;
+ swap_total += nblks;
swapon_check_swzone();
swp_sizecheck();
mtx_unlock(&sw_dev_mtx);
@@ -2351,7 +2364,7 @@
mtx_lock(&sw_dev_mtx);
sp->sw_flags |= SW_CLOSING;
swap_pager_avail -= blist_fill(sp->sw_blist, 0, nblks);
- swap_total -= (vm_ooffset_t)nblks * PAGE_SIZE;
+ swap_total -= nblks;
mtx_unlock(&sw_dev_mtx);
/*

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