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| author | alc <alc@FreeBSD.org> | 2017-06-28 04:01:29 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2017-06-28 04:01:29 +0000 |
| commit | b497b3ce303caf124e91812fdd0aae50dad2f89b (patch) | |
| tree | 546481b4cfad14a9d947dd01efa64aa2a87a374e /sys/i386/include/pmap.h | |
| parent | 022ed953b94b818bfab23e8eb02a79f8e8824cc6 (diff) | |
| download | FreeBSD-src-b497b3ce303caf124e91812fdd0aae50dad2f89b.zip FreeBSD-src-b497b3ce303caf124e91812fdd0aae50dad2f89b.tar.gz | |
MFC r314310
Refine the fix from r312954. Specifically, add a new PDE-only flag,
PG_PROMOTED, that indicates whether lingering 4KB page mappings might
need to be flushed on a PDE change that restricts or destroys a 2MB
page mapping. This flag allows the pmap to avoid range invalidations
that are both unnecessary and costly.
Approved by: re (kib)
Diffstat (limited to 'sys/i386/include/pmap.h')
| -rw-r--r-- | sys/i386/include/pmap.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h index f2d8c58..6e417d9 100644 --- a/sys/i386/include/pmap.h +++ b/sys/i386/include/pmap.h @@ -71,6 +71,7 @@ /* Our various interpretations of the above */ #define PG_W PG_AVAIL1 /* "Wired" pseudoflag */ #define PG_MANAGED PG_AVAIL2 +#define PG_PROMOTED PG_AVAIL3 /* PDE only */ #if defined(PAE) || defined(PAE_TABLES) #define PG_FRAME (0x000ffffffffff000ull) #define PG_PS_FRAME (0x000fffffffe00000ull) |
