memory free question?

[Bill Xie]

My harware is a mips-achitecture hand-hold device runs 2.6.24.3 and
qt.  when an application program  opened a 3.2M pdf file, the memory
was consuming continually, finally the "oom-killer" things happened,
but the memory the application occupied can not be freed.

cat /proc/meminfo
MemTotal:        60288 kB
MemFree:          5100 kB
Buffers:             8 kB
Cached:          25600 kB
SwapCached:          0 kB
Active:          21836 kB
Inactive:        15448 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:               0 kB
Writeback:           0 kB
AnonPages:       11740 kB
Mapped:           1668 kB
Slab:             2532 kB
SReclaimable:      308 kB
SUnreclaim:       2224 kB
PageTables:        164 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:     30144 kB
Committed_AS:    15656 kB
VmallocTotal:  1048404 kB
VmallocUsed:      9700 kB
VmallocChunk:  1038704 kB
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