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When attaching to uprobes through perf subsystem, it's possible to specify
offset of a so-called USDT semaphore, which is just a reference counted u16,
used by kernel to keep track of how many tracers are attached to a given
location. Support for this feature was added in [0], so just wire this through
uprobe_opts. This is important to enable implementing USDT attachment and
tracing through libbpf's bpf_program__attach_uprobe_opts() API.
[0]
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.. | ||
api | ||
bpf | ||
lockdep | ||
perf | ||
subcmd | ||
symbol | ||
traceevent | ||
argv_split.c | ||
bitmap.c | ||
ctype.c | ||
find_bit.c | ||
hweight.c | ||
rbtree.c | ||
str_error_r.c | ||
string.c | ||
vsprintf.c | ||
zalloc.c |