some more ideas

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diff --git a/TODO.md b/TODO.md
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 * Target OS is Rocky 9 and not Rocky 8 (can use a bhyve VM)
 * More filters
+  * By directory
+  * By directory sub-match
+  * By regex match of whole path
+  * By syscall
 * Output format so that it is compatible with the flamegraph grapher
 * Capture more tracepoints? See comments in tracepoints.c's header.
+
+## FlameGraphs
+
+What format? What to visualize on the stack axis?
+
+```
+user;cmd_name;pid;tid;syscall_name count
+user;cmd_name;pid;tid;syscall_name bytes
+
+user;cmd_name;pid;tid;syscall_name duration
+user;cmd_name;pid;tid;syscall_name;fd duration
+user;cmd_name;pid;tid;syscall_name;pathdecoded duration
+
+user;cmd_name;pid;tid;PATHMATCH;syscall_name duration
+user;cmd_name;pid;tid;OTHER;syscall_name duration
+```
+
+`pathdecoded`? Maybe:
+
+* By directory
+* By mountpoint
+* By device
+
+
+Consider:
+
+* File base path or mount point or device name
+* Filename?
+* Time spent between syscalls?