Mercurial > dovecot > original-hg > dovecot-1.2
diff src/lib/file-cache.c @ 2868:316756b50150 HEAD
Use madvise(MADV_DONTNEED) for invalidated pages to free memory.
| author | Timo Sirainen <tss@iki.fi> |
|---|---|
| date | Mon, 08 Nov 2004 03:02:52 +0200 |
| parents | bf1e718e7370 |
| children | d1780331ad04 |
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--- a/src/lib/file-cache.c Mon Nov 08 02:55:02 2004 +0200 +++ b/src/lib/file-cache.c Mon Nov 08 03:02:52 2004 +0200 @@ -171,6 +171,15 @@ offset /= page_size; size -= offset; + if (size != 1) { + /* tell operating system that we don't need the memory anymore + and it may free it. don't bother to do it for single pages, + there's a good chance that they get re-read back + immediately. */ + (void)madvise(PTR_OFFSET(cache->mmap_base, offset * page_size), + size * page_size, MADV_DONTNEED); + } + bits = buffer_get_space_unsafe(cache->page_bitmask, offset / CHAR_BIT, (size + CHAR_BIT - 1) / CHAR_BIT);