Warning: Too many CFI instuctions

[Torsten Polle]

Hi,

I get the following warning when calculating backtraces with SystemTap: "Too many CFI instuctions“. Therefore I change the output of the warning to print out the number of needed instructions.

Too many CFI instuctions: 723
Too many CFI instuctions: 967
Too many CFI instuctions: 571
Too many CFI instuctions: 555
Too many CFI instuctions: 2167
Too many CFI instuctions: 883
Too many CFI instuctions: 647
Too many CFI instuctions: 2691
Too many CFI instuctions: 787
Too many CFI instuctions: 931
Too many CFI instuctions: 1627
Too many CFI instuctions: 751
Too many CFI instuctions: 615
Too many CFI instuctions: 1283
Too many CFI instuctions: 619
Too many CFI instuctions: 663
Too many CFI instuctions: 727
Too many CFI instuctions: 759
Too many CFI instuctions: 579
Too many CFI instuctions: 527
Too many CFI instuctions: 959
Too many CFI instuctions: 1091
Too many CFI instuctions: 1335
Too many CFI instuctions: 515
Too many CFI instuctions: 843
Too many CFI instuctions: 1567
Too many CFI instuctions: 671
Too many CFI instuctions: 539
Too many CFI instuctions: 991
Too many CFI instuctions: 823
Too many CFI instuctions: 1211
Too many CFI instuctions: 627
Too many CFI instuctions: 667
Too many CFI instuctions: 695
Too many CFI instuctions: 639
Too many CFI instuctions: 691
Too many CFI instuctions: 635
Too many CFI instuctions: 587
Too many CFI instuctions: 2299
Too many CFI instuctions: 1019
Too many CFI instuctions: 763
Too many CFI instuctions: 547
Too many CFI instuctions: 523
Too many CFI instuctions: 1095
Too many CFI instuctions: 771
Too many CFI instuctions: 543
Too many CFI instuctions: 875
Too many CFI instuctions: 2223
Too many CFI instuctions: 535
Too many CFI instuctions: 903
Too many CFI instuctions: 799
Too many CFI instuctions: 755
Too many CFI instuctions: 1219
Too many CFI instuctions: 867
Too many CFI instuctions: 592
Too many CFI instuctions: 611
Too many CFI instuctions: 5547
Too many CFI instuctions: 1847

Consequently, I increase the maximum to 8192 in runtime/unwind.c.
#define MAX_CFI 8192

As a result SystemTap behaves as expected.

Would it be possible to either increase the size or make it configurable?

Regards,
Torsten