Ef561 uClinux memory View

After uClinux is started: (Virtual Memory (physical memory) does not exist)

 

Root: ~>Busybox free
Total used free shared Buffers
Mem: 54332 16184 38148 0 0

Memory actually usable =Free + Shared + buffers, which is inaccurate due to the lack of cached.

 

 

Root:/proc>Cat meminfo

Memtotal: 54332 KB
Memfree: 38160 KB
Buffers: 0 KB
Cached: 11732 KB
Swapcached: 0 KB
Active: 2096 KB
Inactive: 9628 KB
Swaptotal: 0 KB
Swapfree: 0 KB
Dirty: 0 KB
Writeback: 0 KB
Anonpages: 0 KB
Mapped: 0 KB
Slab: 1236 KB
Sreclaimable: 752 KB
Sunreclaim: 484 KB
Pagetables: 0 KB
Nfs_unstable: 0 KB
Bounce: 0 KB
Commitlimit: 27164 KB
Committed_as: 0 KB
Vmalloctotal: 0 KB
Vmallocused: 0 KB
Vmallocchunk: 0 KB

 

The actual available memory isMemfree + cached

 

Memory usage of processes:

Root:/proc/99>Cat maps
00250000-0025b000 R-xs 00000000 01 417/lib/libgcc_s.so.1
00280000-002a0000 rwxp 00000000 0
002a0000-002a5000 RW-P 00000000 0
00700000-00750000 R-xs 00000000 145/bin/busybox
007a0000-007ab000 RW-P 0004f000 00:01 145/bin/busybox
007be000-007bf000 RW-P 00000000 00:00 0
00d28000-00d2f000 R-xs 00000000 419/lib/ld-uClibc-0.9.29.so
00d40000-00d78000 R-xs 00000000 378/lib/libuClibc-0.9.29.so
00d9c000-00d9e000 RW-P 00006000 419/lib/ld-uClibc-0.9.29.so
00dd9000-00dda000 RW-P 00000000 00:00 0
00dde000-00de0000 RW-P 00000000 0

For details, see "embedded Linux memory usage and performance optimization.