The malloc_test Module

When doing the tests, check also for the possibility of the memory being overwritten. When activated, the allocated memory will be filled with a special pattern, that will be checked on free.

Default: 0 (off).

It can be changed also at runtime, via the rpc interface.

modparam("malloc_test", "check_content", 1)

$ kamcmd cfg.set_now_int malloc_test check_content 1

Allocates size bytes.

...
mem_alloc(1048576); # 1MB
...

Frees all the memory allocated with mem_alloc() up to this point.

...
mem_free();
...

Allocates the specified number of bytes. unit is optional and can be one of:

 $ kamcmd mt.mem_alloc 10 k

Frees at least size bytes from the memory allocated by other malloc_test functions (e.g. mt.mem_alloc).

size is optional. If missing, everything will be freed.

unit is optional and can be one of:

 $ kamcmd mt.mem_free 1 m

Returns/displays how many bytes are allocated. The default unit is bytes (for all the possible units see above).

unit is optional and can be one of:

 $ kamcmd mt.mem_used
9221460

Allocates total_size memory, in pieces of random size between min .. max (inclusive). unit is optional and represents the unit for all the given sizes (see above).

 $ kamcmd mt.mem_rnd_alloc 1 64 10240 k

Starts a malloc test that will take total_time to execute. Memory allocations will be performed at intervals randomly chosen between min_int and max_int (in ms). Each allocation will have a randomly chosen size between min and max unit bytes. After total unit bytes are allocated, everything is released/freed again and the allocations are restarted. All the times are expressed in milliseconds. unit is optional and represents the unit for all the given sizes (see above).

Several tests can be run in parallel.

Returns the test id.

 $ kamcmd mt.mem_test_start 15 64 25000 128 1500 3600000 k
1

Stops the test indentified by id.

 $ kamcmd mt.mem_test_stop 1

Destroys the test indentified by id (besides stopping it, it also frees all the data, including the statistics).

 $ kamcmd mt.mem_test_destroy 1

Destroys all the running or stopped tests.

 $ kamcmd mt.mem_test_destroy_all

Returns/displays data about the test identified by id, or if no id is specified, it lists all the tests (running or stopped).

unit is optional. The default is is bytes (for all the possible units see above).

 $ kamcmd mt.mem_test_list
{
	ID           : 2
	run time (s) : 1471
	remaining (s): 2128
	allocations  : 1749
	errors       : 24
	overflows    : 2
	total alloc  : 69614530
	min          : 15360
	max          : 65536
	total        : 25600000
}
{
	ID           : 1
	run time (s) : 3600
	remaining (s): 0
	allocations  : 4268
	errors       : 640
	overflows    : 4
	total alloc  : 144220713
	min          : 15360
	max          : 65536
	total        : 29696000
}