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authorAlexei Starovoitov <ast@fb.com>2016-02-17 19:58:58 -0800
committerDavid S. Miller <davem@davemloft.net>2016-02-20 00:21:44 -0500
commitd5a3b1f691865be576c2bffa708549b8cdccda19 (patch)
tree12f6009f168baee6889a0fde07d60ac3f5c12aac /samples
parent568b329a02f75ed3aaae5eb2cca384cb9e09cb29 (diff)
downloadlinux-sh-d5a3b1f691865be576c2bffa708549b8cdccda19.tar.gz
bpf: introduce BPF_MAP_TYPE_STACK_TRACE
add new map type to store stack traces and corresponding helper bpf_get_stackid(ctx, map, flags) - walk user or kernel stack and return id @ctx: struct pt_regs* @map: pointer to stack_trace map @flags: bits 0-7 - numer of stack frames to skip bit 8 - collect user stack instead of kernel bit 9 - compare stacks by hash only bit 10 - if two different stacks hash into the same stackid discard old other bits - reserved Return: >= 0 stackid on success or negative error stackid is a 32-bit integer handle that can be further combined with other data (including other stackid) and used as a key into maps. Userspace will access stackmap using standard lookup/delete syscall commands to retrieve full stack trace for given stackid. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples')
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