⚡ Bolt: Optimize drawstatusbar memory allocation #189
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Reduces memory allocation overhead in the frequent status bar update path by using a stack buffer for strings up to 1024 bytes. Fallbacks to malloc for larger strings. Co-authored-by: paperbenni <15818888+paperbenni@users.noreply.github.com>
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Reviewer's guide (collapsed on small PRs)Reviewer's Guidedrawstatusbar now prefers an on-stack 1 KiB buffer and only falls back to heap allocation for longer status strings, eliminating malloc/free in the hot path under normal workloads; the new log entry documents this micro-optimization. Flow diagram for drawstatusbar buffer selectionflowchart TD
A["Start drawstatusbar"] --> B["Compute len = strlen(stext) + 1"]
B --> C{"len > sizeof(buf)?"}
C -- Yes --> D["Allocate heap buffer malloc(len)"]
D --> E["Copy stext into heap buffer"]
E --> G["Render status text"]
C -- No --> F["Use stack buffer buf"]
F --> E
G --> H{"Heap buffer used?"}
H -- Yes --> I["free heap buffer"]
H -- No --> J["Skip free"]
I --> K["Return"]
J --> K
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Hey - I've left some high level feedback:
- Consider tying the 1024-byte stack buffer size to the existing global status text limit (e.g., via a shared constant or macro) so they can't silently diverge in the future.
- You can simplify the allocation logic slightly by only tracking a separate
heap_bufpointer for the malloc case instead of overloadingp, keepingtextas the sole working buffer.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- Consider tying the 1024-byte stack buffer size to the existing global status text limit (e.g., via a shared constant or macro) so they can't silently diverge in the future.
- You can simplify the allocation logic slightly by only tracking a separate `heap_buf` pointer for the malloc case instead of overloading `p`, keeping `text` as the sole working buffer.Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
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⚡ Bolt: Optimize drawstatusbar memory allocation
💡 What:
Replaced heap allocation (
malloc/free) with stack allocation (char buf[1024]) indrawstatusbarfor strings that fit within the standard 1024-byte limit. Added a fallback tomallocfor larger strings to ensure safety.🎯 Why:
drawstatusbaris called frequently (e.g., every second or more on status updates). Avoidingmallocreduces allocator overhead and fragmentation in this hot path.📊 Impact:
Removes one
malloc/freepair per status bar redraw for normal usage.🔬 Measurement:
Verified by inspection and successful build (
make clean && make). The code logic ensuresmallocis only used when necessary and memory is correctly freed.PR created automatically by Jules for task 3776993879807769484 started by @paperbenni
Summary by Sourcery
Enhancements: