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Increase the pageout cluster size to 32 pages.

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Decouple the pageout cluster size from the size of the hash table entry
used by the swap pager for mapping (object, pindex) to a block on the
swap device(s), and keep the size of a hash table entry at its current
size.

Eliminate a pointless macro.

Reviewed by:	kib, markj (an earlier version)
MFC after:	4 weeks
Differential Revision:	https://reviews.freebsd.org/D11305
This commit is contained in:
Alan Cox 2017-06-24 17:10:33 +00:00
parent a36deee3d3
commit e22415906d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320319
2 changed files with 3 additions and 4 deletions
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4
sys/vm/swap_pager.c
View file

@ -120,7 +120,7 @@ __FBSDID("$FreeBSD$");
* The 64-page limit is due to the radix code (kern/subr_blist.c).
*/
#ifndef MAX_PAGEOUT_CLUSTER
#define MAX_PAGEOUT_CLUSTER 16
#define MAX_PAGEOUT_CLUSTER 32
#endif
#if !defined(SWB_NPAGES)
@ -134,7 +134,7 @@ __FBSDID("$FreeBSD$");
* Unused disk addresses within a swap area are allocated and managed
* using a blist.
*/
#define SWAP_META_PAGES (SWB_NPAGES * 2)
#define SWAP_META_PAGES 32
#define SWAP_META_MASK (SWAP_META_PAGES - 1)
struct swblock {

3
sys/vm/vm_pageout.c
View file

@ -251,8 +251,7 @@ static u_int vm_background_launder_max = 20 * 1024;
SYSCTL_UINT(_vm, OID_AUTO, background_launder_max, CTLFLAG_RW,
&vm_background_launder_max, 0, "background laundering cap, in kilobytes");
#define VM_PAGEOUT_PAGE_COUNT 16
int vm_pageout_page_count = VM_PAGEOUT_PAGE_COUNT;
int vm_pageout_page_count = 32;
int vm_page_max_wired; /* XXX max # of wired pages system-wide */
SYSCTL_INT(_vm, OID_AUTO, max_wired,