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Simple code refactoring originally in D13484.

Browse Source 
Extract swp_pager_force_dirty() and swp_pager_force_launder() out of
swp_pager_force_pagein().

Extract swap_pager_swapoff_object() out of swap_pager_swapoff().

Submitted by: ota_j.email.ne.jp
Reviewed by: alc, dougm
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D20545
This commit is contained in:
Doug Moore 2019-06-08 17:49:17 +00:00
parent 4c62bffef5
commit 7c022327ab
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348809
1 changed files with 55 additions and 28 deletions
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83
sys/vm/swap_pager.c
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@ -1650,6 +1650,31 @@ swap_pager_nswapdev(void)
return (nswapdev);
}
static void
swp_pager_force_dirty(vm_page_t m)
{
vm_page_dirty(m);
#ifdef INVARIANTS
vm_page_lock(m);
if (!vm_page_wired(m) && m->queue == PQ_NONE)
panic("page %p is neither wired nor queued", m);
vm_page_unlock(m);
#endif
vm_page_xunbusy(m);
}
static void
swp_pager_force_launder(vm_page_t m)
{
vm_page_dirty(m);
vm_page_lock(m);
vm_page_launder(m);
vm_page_unlock(m);
vm_page_xunbusy(m);
}
/*
* SWP_PAGER_FORCE_PAGEIN() - force a swap block to be paged in
*
@ -1667,7 +1692,7 @@ swap_pager_nswapdev(void)
* XXX - The code to page the whole block in doesn't work, so we
* revert to the one-by-one behavior for now. Sigh.
*/
static inline void
static void
swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
{
vm_page_t m;
@ -1676,14 +1701,7 @@ swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL);
if (m->valid == VM_PAGE_BITS_ALL) {
vm_object_pip_wakeup(object);
vm_page_dirty(m);
#ifdef INVARIANTS
vm_page_lock(m);
if (!vm_page_wired(m) && m->queue == PQ_NONE)
panic("page %p is neither wired nor queued", m);
vm_page_unlock(m);
#endif
vm_page_xunbusy(m);
swp_pager_force_dirty(m);
vm_pager_page_unswapped(m);
return;
}
@ -1691,14 +1709,35 @@ swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
if (swap_pager_getpages(object, &m, 1, NULL, NULL) != VM_PAGER_OK)
panic("swap_pager_force_pagein: read from swap failed");/*XXX*/
vm_object_pip_wakeup(object);
vm_page_dirty(m);
vm_page_lock(m);
vm_page_launder(m);
vm_page_unlock(m);
vm_page_xunbusy(m);
swp_pager_force_launder(m);
vm_pager_page_unswapped(m);
}
/*
* swap_pager_swapoff_object:
*
* Page in all of the pages that have been paged out for an object
* from a given swap device.
*/
static void
swap_pager_swapoff_object(struct swdevt *sp, vm_object_t object)
{
struct swblk *sb;
vm_pindex_t pi;
int i;
for (pi = 0; (sb = SWAP_PCTRIE_LOOKUP_GE(
&object->un_pager.swp.swp_blks, pi)) != NULL; ) {
pi = sb->p + SWAP_META_PAGES;
for (i = 0; i < SWAP_META_PAGES; i++) {
if (sb->d[i] == SWAPBLK_NONE)
continue;
if (swp_pager_isondev(sb->d[i], sp))
swp_pager_force_pagein(object, sb->p + i);
}
}
}
/*
* swap_pager_swapoff:
*
@ -1712,10 +1751,8 @@ swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
static void
swap_pager_swapoff(struct swdevt *sp)
{
struct swblk *sb;
vm_object_t object;
vm_pindex_t pi;
int i, retries;
int retries;
sx_assert(&swdev_syscall_lock, SA_XLOCKED);
@ -1745,17 +1782,7 @@ swap_pager_swapoff(struct swdevt *sp)
if (object->type != OBJT_SWAP)
goto next_obj;
for (pi = 0; (sb = SWAP_PCTRIE_LOOKUP_GE(
&object->un_pager.swp.swp_blks, pi)) != NULL; ) {
pi = sb->p + SWAP_META_PAGES;
for (i = 0; i < SWAP_META_PAGES; i++) {
if (sb->d[i] == SWAPBLK_NONE)
continue;
if (swp_pager_isondev(sb->d[i], sp))
swp_pager_force_pagein(object,
sb->p + i);
}
}
swap_pager_swapoff_object(sp, object);
next_obj:
VM_OBJECT_WUNLOCK(object);
mtx_lock(&vm_object_list_mtx);