diff options
| author | Brian Behlendorf <[email protected]> | 2011-03-30 17:44:35 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2011-04-06 20:06:03 -0700 |
| commit | e76f4bf11d54479fe767d9647a10e8b98d7ffc4f (patch) | |
| tree | 213970e408e6c9b808184abd7fb7e3920cee0c52 /config | |
| parent | 83150861e610701d44510816e2062bcf407f51ab (diff) | |
Add dnlc_reduce_cache() support
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.
Diffstat (limited to 'config')
| -rw-r--r-- | config/spl-build.m4 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/config/spl-build.m4 b/config/spl-build.m4 index 72bb3258e..94c7f3e74 100644 --- a/config/spl-build.m4 +++ b/config/spl-build.m4 @@ -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])], + []) +]) |