Nevermind. Turns out the system will release the slab memory no problem,
it's a bad malloc call that causes the problem. Nothing wrong with slab.
Alex
On Thu, 29 Sep 2005, Alexander Lazarevich wrote:
We have a RHEL4-AS 64bit system, and a FC364bit system. Both running most
recent kernels.
We've got bad memory problems. The kernel is sucking up quite a bit of
memory, check out Slab in meminfo:
[root@hostname ~]# cat /proc/meminfo
MemTotal: 8078596 kB
MemFree: 486480 kB
Buffers: 1075532 kB
Cached: 527284 kB
SwapCached: 1384 kB
Active: 2120352 kB
Inactive: 1019628 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 8078596 kB
LowFree: 486480 kB
SwapTotal: 2096472 kB
SwapFree: 2053372 kB
Dirty: 28 kB
Writeback: 0 kB
Mapped: 1564776 kB
Slab: 4424180 kB
CommitLimit: 6135768 kB
Committed_AS: 1836712 kB
PageTables: 9952 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 1356 kB
VmallocChunk: 34359736951 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 2048 kB
Then, slabtop is showing what is using all that slab mem:
Active / Total Objects (% used) : 9028210 / 9033666 (99.9%)
Active / Total Slabs (% used) : 1105829 / 1105834 (100.0%)
Active / Total Caches (% used) : 94 / 135 (69.6%)
Active / Total Size (% used) : 108142.02K / 108819.82K (99.4%)
Minimum / Average / Maximum Object : 0.02K / 0.01K / 128.00K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
4181455 4181452 99% 0.78K 836291 5 3345164K ext3_inode_cache
4129011 4129007 99% 0.23K 242883 17 971532K dentry_cache
Why in the heck is the system trying to use all this memory to cache ext3
inodes? This happens on both FC364bit and RHEL4-AS64bit.
I've search google and bugzilla, couldn't find anything.
Anyone see this as well?
Thanks!
Alex
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