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Add dnlc_reduce_cache() support

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Provide the dnlc_reduce_cache() function which attempts to prune
cached entries from the dcache and icache.  After the entries are
pruned any slabs which they may have been using are reaped.

Note the API takes a reclaim percentage but we don't have easy
access to the total number of cache entries to calculate the
reclaim count.  However, in practice this doesn't need to be
exactly correct.  We simply need to reclaim some useful fraction
(but not all) of the cache.  The caller can determine if more
needs to be done.
This commit is contained in:
Brian Behlendorf
2011-03-30 17:44:35 -07:00
parent 83150861e6
commit e76f4bf11d
6 changed files with 283 additions and 1 deletions
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config/spl-build.m4
+32
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@@ -76,6 +76,8 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_3ARGS_FILE_FSYNC
SPL_AC_EXPORTED_RWSEM_IS_LOCKED
SPL_AC_KERNEL_INVALIDATE_INODES
SPL_AC_SHRINK_DCACHE_MEMORY
SPL_AC_SHRINK_ICACHE_MEMORY
])
AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
@@ -1717,3 +1719,33 @@ AC_DEFUN([SPL_AC_KERNEL_INVALIDATE_INODES], [
[invalidate_inodes() is available])],
[])
])
dnl #
dnl # 2.6.xx API compat,
dnl # There currently exists no exposed API to partially shrink the dcache.
dnl # The expected mechanism to shrink the cache is a registered shrinker
dnl # which is called during memory pressure.
dnl #
AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY], [
SPL_CHECK_SYMBOL_EXPORT(
[shrink_dcache_memory],
[fs/dcache.c],
[AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
[shrink_dcache_memory() is available])],
[])
])
dnl #
dnl # 2.6.xx API compat,
dnl # There currently exists no exposed API to partially shrink the icache.
dnl # The expected mechanism to shrink the cache is a registered shrinker
dnl # which is called during memory pressure.
dnl #
AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY], [
SPL_CHECK_SYMBOL_EXPORT(
[shrink_icache_memory],
[fs/inode.c],
[AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
[shrink_icache_memory() is available])],
[])
])