alloc_callchain_buffers

Name:alloc_callchain_buffers

Proto:static int alloc_callchain_buffers(void)

Type:int

Parameter:Nothing

81

size = offsetof(structcallchain_cpus_entries, cpu_entries[Setup number of possible processor ids ])

83

entries = kzalloc - allocate memory. The memory is set to zero.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc).

84

If Not entries Then Return -ENOMEM

87

size = perf_callchain_entry__sizeof() * Number of contexts where an event can trigger:* task, softirq, hardirq, nmi.

89

for_each_possible_cpu(cpu)

90

cpu_entries[cpu] = kmalloc_node(size, GFP_KERNEL, cpu_to_node(cpu))

92

If Not cpu_entries[cpu] Then Go to fail

96

cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(callchain_cpus_entries, entries)

98

Return 0

100

fail :

101

for_each_possible_cpu(cpu)

102

kfree(cpu_entries[cpu])

103

105

Return -ENOMEM

**Caller**
Name	Describe
get_callchain_buffers

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion