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author | alc <alc@FreeBSD.org> | 2009-02-25 07:52:53 +0000 |
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committer | alc <alc@FreeBSD.org> | 2009-02-25 07:52:53 +0000 |
commit | 8a8f5251fa38b7eed0a1411e89502dd307d6eac2 (patch) | |
tree | d46606eab2e40cdb828299d8647ddb39d14f9e71 | |
parent | ba8a8daf8d72a5148614af6990c0a54582c18103 (diff) | |
download | FreeBSD-src-8a8f5251fa38b7eed0a1411e89502dd307d6eac2.zip FreeBSD-src-8a8f5251fa38b7eed0a1411e89502dd307d6eac2.tar.gz |
Prior to r188331 a map entry's last read offset was only updated by a hard
fault. In r188331 this update was relocated because of synchronization
changes to a place where it would occur on both hard and soft faults. This
change again restricts the update to hard faults.
-rw-r--r-- | sys/vm/vm_fault.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index e647288..bd7de42 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -868,13 +868,17 @@ vnode_locked: } } /* - * update lastr imperfectly (we do not know how much - * getpages will actually read), but good enough. + * If the page was filled by a pager, update the map entry's + * last read offset. Since the pager does not return the + * actual set of pages that it read, this update is based on + * the requested set. Typically, the requested and actual + * sets are the same. * * XXX The following assignment modifies the map * without holding a write lock on it. */ - fs.entry->lastr = fs.pindex + faultcount - behind; + if (hardfault) + fs.entry->lastr = fs.pindex + faultcount - behind; if (prot & VM_PROT_WRITE) { vm_object_set_writeable_dirty(fs.object); |