Tomas Glozar 6cc45f8c1f rtla/timerlat: Fix histogram ALL for zero samples ... rtla timerlat hist currently computers the minimum, maximum and average latency even in cases when there are zero samples. This leads to nonsensical values being calculated for maximum and minimum, and to divide by zero for average. A similar bug is fixed by 01b05fc0e5 ("rtla/timerlat: Fix histogram report when a cpu count is 0") but the bug still remains for printing the sum over all CPUs in timerlat_print_stats_all. The issue can be reproduced with this command: $ rtla timerlat hist -U -d 1s Index over: count: min: avg: max: Floating point exception (core dumped) (There are always no samples with -U unless the user workload is created.) Fix the bug by omitting max/min/avg when sample count is zero, displaying a dash instead, just like we already do for the individual CPUs. The logic is moved into a new function called format_summary_value, which is used for both the individual CPUs and for the overall summary. Cc: stable@vger.kernel.org Link: https://lore.kernel.org/20241127134130.51171-1-tglozar@redhat.com Fixes: 1462501c7a ("rtla/timerlat: Add a summary for hist mode") Signed-off-by: Tomas Glozar <tglozar@redhat.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>		2024-12-27 11:21:46 -05:00
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latency	tools/latency: Use pkg-config in lib_setup of Makefile.config	2024-07-17 13:15:18 -07:00
rtla	rtla/timerlat: Fix histogram ALL for zero samples	2024-12-27 11:21:46 -05:00
Makefile	tools/tracing: Update Makefile to build rtla	2022-01-27 19:15:47 -05:00