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| author | kib <kib@FreeBSD.org> | 2011-09-06 10:30:11 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2011-09-06 10:30:11 +0000 |
| commit | a9d505a22a9d9d343bf6874e995b921ad977453c (patch) | |
| tree | 608b3b06589b15335451f37a8c8b11d1779e9a72 /sys/vm/vm_mmap.c | |
| parent | a6bb123606f7afa6fb3342b35dad217c76951ee3 (diff) | |
| download | FreeBSD-src-a9d505a22a9d9d343bf6874e995b921ad977453c.zip FreeBSD-src-a9d505a22a9d9d343bf6874e995b921ad977453c.tar.gz | |
Split the vm_page flags PG_WRITEABLE and PG_REFERENCED into atomic
flags field. Updates to the atomic flags are performed using the atomic
ops on the containing word, do not require any vm lock to be held, and
are non-blocking. The vm_page_aflag_set(9) and vm_page_aflag_clear(9)
functions are provided to modify afalgs.
Document the changes to flags field to only require the page lock.
Introduce vm_page_reference(9) function to provide a stable KPI and
KBI for filesystems like tmpfs and zfs which need to mark a page as
referenced.
Reviewed by: alc, attilio
Tested by: marius, flo (sparc64); andreast (powerpc, powerpc64)
Approved by: re (bz)
Diffstat (limited to 'sys/vm/vm_mmap.c')
| -rw-r--r-- | sys/vm/vm_mmap.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c index a46d6b5..ce899e9 100644 --- a/sys/vm/vm_mmap.c +++ b/sys/vm/vm_mmap.c @@ -901,16 +901,16 @@ RestartScan: if (m->dirty != 0) mincoreinfo |= MINCORE_MODIFIED_OTHER; /* - * The first test for PG_REFERENCED is an + * The first test for PGA_REFERENCED is an * optimization. The second test is * required because a concurrent pmap * operation could clear the last reference - * and set PG_REFERENCED before the call to + * and set PGA_REFERENCED before the call to * pmap_is_referenced(). */ - if ((m->flags & PG_REFERENCED) != 0 || + if ((m->aflags & PGA_REFERENCED) != 0 || pmap_is_referenced(m) || - (m->flags & PG_REFERENCED) != 0) + (m->aflags & PGA_REFERENCED) != 0) mincoreinfo |= MINCORE_REFERENCED_OTHER; } if (object != NULL) |
