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Add a new function swap_pager_status() which reports the total size of the

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paging space and how much of it is in use (in pages).

Use this interface from the Linuxolator instead of groping around in the
internals of the swap_pager.
This commit is contained in:
Poul-Henning Kamp 2003-07-18 10:26:09 +00:00
parent e9c0cc157b
commit 567104a148
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=117723
4 changed files with 27 additions and 18 deletions
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13
sys/compat/linprocfs/linprocfs.c
View File

@ -121,6 +121,7 @@ linprocfs_domeminfo(PFS_FILL_ARGS)
unsigned long long swapused; /* used swap space in bytes */
unsigned long long swapfree; /* free swap space in bytes */
vm_object_t object;
int i, j;
memtotal = physmem * PAGE_SIZE;
/*
@ -135,14 +136,10 @@ linprocfs_domeminfo(PFS_FILL_ARGS)
*/
memused = cnt.v_wire_count * PAGE_SIZE;
memfree = memtotal - memused;
if (swapblist == NULL) {
swaptotal = 0;
swapfree = 0;
} else {
swaptotal = (u_quad_t)swapblist->bl_blocks * 1024; /* XXX why 1024? */
swapfree = (u_quad_t)swapblist->bl_root->u.bmu_avail * PAGE_SIZE;
}
swapused = swaptotal - swapfree;
swap_pager_status(&i, &j);
swaptotal = i * PAGE_SIZE;
swapused = j * PAGE_SIZE;
swapfree = swaptotal - swapused;
memshared = 0;
TAILQ_FOREACH(object, &vm_object_list, object_list)
if (object->shadow_count > 1)

12
sys/compat/linux/linux_misc.c
View File

@ -108,7 +108,7 @@ linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
{
struct l_sysinfo sysinfo;
vm_object_t object;
int i;
int i, j;
struct timespec ts;
/* Uptime is copied out of print_uptime() in kern_shutdown.c */
@ -144,13 +144,9 @@ linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
sysinfo.sharedram *= PAGE_SIZE;
sysinfo.bufferram = 0;
if (swapblist == NULL) {
sysinfo.totalswap= 0;
sysinfo.freeswap = 0;
} else {
sysinfo.totalswap = swapblist->bl_blocks * 1024;
sysinfo.freeswap = swapblist->bl_root->u.bmu_avail * PAGE_SIZE;
}
swap_pager_status(&i, &j);
sysinfo.totalswap= i * PAGE_SIZE;
sysinfo.freeswap = (i - j) * PAGE_SIZE;
sysinfo.procs = 20; /* Hack */

18
sys/vm/swap_pager.c
View File

@ -142,7 +142,7 @@ static int nsw_wcount_async; /* limit write buffers / asynchronous */
static int nsw_wcount_async_max;/* assigned maximum */
static int nsw_cluster_max; /* maximum VOP I/O allowed */
struct blist *swapblist;
static struct blist *swapblist;
static struct swblock **swhash;
static int swhash_mask;
static int swap_async_max = 4; /* maximum in-progress async I/O's */
@ -2666,6 +2666,22 @@ swapoff(td, uap)
return (error);
}
void
swap_pager_status(int *total, int *used)
{
struct swdevt *sp;
int i;
*total = 0;
*used = 0;
for (sp = swdevt, i = 0; i < nswdev; i++, sp++) {
if (sp->sw_vp == NULL)
continue;
*total += sp->sw_nblks;
*used += sp->sw_used;
}
}
static int
sysctl_vm_swap_info(SYSCTL_HANDLER_ARGS)
{

2
sys/vm/swap_pager.h
View File

@ -93,7 +93,6 @@ struct swdevt {
#define SWAP_META_MASK (SWAP_META_PAGES - 1)
extern int swap_pager_full;
extern struct blist *swapblist;
extern int vm_swap_size;
void swap_pager_putpages(vm_object_t, vm_page_t *, int, boolean_t, int *);
@ -102,6 +101,7 @@ void swap_pager_freespace(vm_object_t, vm_pindex_t, vm_size_t);
void swap_pager_swap_init(void);
int swap_pager_isswapped(vm_object_t, int);
int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_size_t);
void swap_pager_status(int *total, int *used);
#endif /* _KERNEL */
#endif /* _VM_SWAP_PAGER_H_ */