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| author | alc <alc@FreeBSD.org> | 2015-09-27 01:35:32 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2015-09-27 01:35:32 +0000 |
| commit | 32fcd5e4dc4723f8c517d84e8c6ff9edbd496232 (patch) | |
| tree | 246a921d955c0af818a01dadb0a473d45512a916 /sys/vm/vm_pageout.c | |
| parent | b44e8c14438c6602432ef5d490df5fd818d5a1db (diff) | |
| download | FreeBSD-src-32fcd5e4dc4723f8c517d84e8c6ff9edbd496232.zip FreeBSD-src-32fcd5e4dc4723f8c517d84e8c6ff9edbd496232.tar.gz | |
MFC r287121
Testing whether a page is dirty does not require the page lock.
Diffstat (limited to 'sys/vm/vm_pageout.c')
| -rw-r--r-- | sys/vm/vm_pageout.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c index dce3aad..3e019fb 100644 --- a/sys/vm/vm_pageout.c +++ b/sys/vm/vm_pageout.c @@ -408,10 +408,13 @@ more: ib = 0; break; } - vm_page_lock(p); vm_page_test_dirty(p); - if (p->dirty == 0 || - p->queue != PQ_INACTIVE || + if (p->dirty == 0) { + ib = 0; + break; + } + vm_page_lock(p); + if (p->queue != PQ_INACTIVE || p->hold_count != 0) { /* may be undergoing I/O */ vm_page_unlock(p); ib = 0; @@ -435,10 +438,11 @@ more: if ((p = vm_page_next(ps)) == NULL || vm_page_busied(p)) break; - vm_page_lock(p); vm_page_test_dirty(p); - if (p->dirty == 0 || - p->queue != PQ_INACTIVE || + if (p->dirty == 0) + break; + vm_page_lock(p); + if (p->queue != PQ_INACTIVE || p->hold_count != 0) { /* may be undergoing I/O */ vm_page_unlock(p); break; |
