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Fix: task_struct backwards-compatibility with kernel versions < 5.14 #53

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Merged
tanelpoder merged 1 commit into from
Dec 11, 2024
Merged

Fix: task_struct backwards-compatibility with kernel versions < 5.14 #53

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12 changes: 12 additions & 0 deletions bin/xcapture-bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -160,7 +160,11 @@ int update_cpu_stack_profile(struct bpf_perf_event_data *ctx) {
t->tid = tid;
t->pid = pid;
t->uid = (s32) (bpf_get_current_uid_gid() & 0xFFFFFFFF);
#if LINUX_VERSION_MAJOR >= 5 && LINUX_VERSION_PATCHLEVEL >= 14
t->state = curtask->__state;
#else
t->state = curtask->state;
#endif
bpf_probe_read_str(t->comm, sizeof(t->comm), (struct task_struct *)curtask->comm);

#ifdef CMDLINE
Expand Down Expand Up @@ -267,7 +271,11 @@ RAW_TRACEPOINT_PROBE(sched_switch) {
bool *preempt = (bool *)ctx->args[0];
struct task_struct *prev = (struct task_struct *)ctx->args[1];
struct task_struct *next = (struct task_struct *)ctx->args[2];
#if LINUX_VERSION_MAJOR >= 5 && LINUX_VERSION_PATCHLEVEL >= 14
unsigned int prev_state = prev->__state; // ctx->args[3] won't work in older configs due to breaking change in sched_switch tracepoint
#else
unsigned int prev_state = prev->state;
#endif

s32 prev_tid = prev->pid; // task (tid in user tools)
s32 prev_pid = prev->tgid; // tgid (pid in user tools)
Expand Down Expand Up @@ -326,7 +334,11 @@ RAW_TRACEPOINT_PROBE(sched_switch) {
//if (!t_next->comm[0])
bpf_probe_read_str(t_next->comm, sizeof(t_next->comm), next->comm);

#if LINUX_VERSION_MAJOR >= 5 && LINUX_VERSION_PATCHLEVEL >= 14
t_next->state = next->__state;
#else
t_next->state = next->state;
#endif
t_next->in_sched_migrate = 0;
t_next->in_sched_waking = 0;
t_next->in_sched_wakeup = 0;
Expand Down