diff options
Diffstat (limited to 'share/man/man9/buf.9')
| -rw-r--r-- | share/man/man9/buf.9 | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/share/man/man9/buf.9 b/share/man/man9/buf.9 index b809b82..2343e27 100644 --- a/share/man/man9/buf.9 +++ b/share/man/man9/buf.9 @@ -68,7 +68,7 @@ bits. These bits are generally set and cleared in groups based on the device block size of the device backing the page. Complete page's worth are often -referred to using the VM_PAGE_BITS_ALL bitmask (i.e. 0xFF if the hardware page +referred to using the VM_PAGE_BITS_ALL bitmask (i.e., 0xFF if the hardware page size is 4096). .Pp VM buffers also keep track of a byte-granular dirty range and valid range. @@ -111,9 +111,10 @@ This can create confusion within file system devices that use delayed-writes because you wind up with pages marked clean that are actually still dirty. If not -treated carefully, these pages could be thrown away! Indeed, a number of +treated carefully, these pages could be thrown away! +Indeed, a number of serious bugs related to this hack were not fixed until the 2.2.8/3.0 release. -The kernel uses an instantiated VM buffer (i.e. struct buf) to place-mark pages +The kernel uses an instantiated VM buffer (i.e., struct buf) to place-mark pages in this special state. The buffer is typically flagged B_DELWRI. When a |
