Comments (3)
With DTv1, aggregations were accumulated in user space. Each printa() would read buffers and add them to the already fetched data.
With DTv2, aggregations are accumulated by the kernel in BPF maps. Each printa() reads the BPF map afresh. It should not add newly read data to older data.
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Actually, even just multiple printa() actions are enough to demonstrate the problem.
BEGIN {
@a = sum(1);
@b = count();
@c = sum(1);
printa(@a);
printa(@b);
printa(@c);
exit(0)
}
This should print 1, 1, 1, as it does with DTv1, but it prints 1, 2, 3 with DTv2. This was causing tst.llquantize_basic.d to fail.
from dtrace-utils.
Verified as fixed.
from dtrace-utils.
Related Issues (18)
- test test HOT 1
- Do not report unused aggregations HOT 1
- tst.multiagg3.d fails: formatted printa() HOT 3
- substr() stores the wrong string length HOT 1
- strjoin() can store lenghts beyond strsize HOT 1
- dt_cg_store_var() needs to copy terminating NUL byte for strings HOT 1
- TLS struct variables should be allocated only for nonzero values
- Need better diagnostics for when dynvarsize < dt_maxtlslen HOT 1
- dtrace: could not enable tracing: BPF program load for '...' failed: No space left on device HOT 3
- Inconsistent behaviour between trace(strtok(...)) and s = strtok(...); trace(s)
- TLS variables (self->x) can be declared with an array datatype but cannot be used as such HOT 1
- How to convert other types to char* or string with dtrace HOT 2
- invalid user access in action HOT 5
- bpf-helpers.h HOT 3
- Unrecognized PERF_RECORD_* causes "dtrace: processing aborted: Success" HOT 1
- RFE: please provide packaging friendly versioning HOT 5
- 2.0.0-1.1: build fails with `__KERNEL__` redefined HOT 14
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