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terminal: PageList preheats only the viewport and cursor pins

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This commit is contained in:
Mitchell Hashimoto
2026-09-03 13:59:43 -07:00
parent efa3c66ed1
commit 35a6fb747f
1 changed files with 21 additions and 8 deletions
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29
src/terminal/PageList.zig
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@@ -43,6 +43,11 @@ const page_preheat = 4;
/// we preheat that one and let the pool grow on demand.
const node_preheat = 1;
/// The number of pins we preheat the pin pool with: the viewport pin that
/// every PageList tracks and the cursor pin that every Screen tracks.
/// Selections, searches, and so on grow the pool on demand.
const pin_preheat = 2;
/// The list of pages in the screen. These are expected to be in order
/// where the first page is the topmost page (scrollback) and the last is
/// the bottommost page (the current active page).
@@ -370,7 +375,7 @@ pub const MemoryPool = struct {
errdefer node_pool.deinit();
var page_pool = try PagePool.initCapacity(gen_alloc, page_alloc, preheat);
errdefer page_pool.deinit();
var pin_pool = try PinPool.initCapacity(gen_alloc, 8);
var pin_pool = try PinPool.initCapacity(gen_alloc, pin_preheat);
errdefer pin_pool.deinit();
return .{
.alloc = gen_alloc,
@@ -664,11 +669,10 @@ pub fn init(
try tw.check(.viewport_pin);
const viewport_pin = try pool.pins.create();
viewport_pin.* = .{ .node = page_list.first.? };
var tracked_pins: PinSet = .{};
errdefer tracked_pins.deinit(pool.alloc);
try tw.check(.viewport_pin_track);
try tracked_pins.putNoClobber(pool.alloc, viewport_pin, {});
var tracked_pins = try initTrackedPins(pool.alloc, viewport_pin);
errdefer tracked_pins.deinit(pool.alloc);
errdefer comptime unreachable;
const result: PageList = .{
@@ -690,6 +694,17 @@ pub fn init(
return result;
}
/// Create the tracked pin set for a new PageList with the viewport pin
/// already tracked. The set is sized for exactly the viewport pin and the
/// cursor pin that every Screen tracks.
fn initTrackedPins(alloc: Allocator, viewport_pin: *Pin) Allocator.Error!PinSet {
var set: PinSet = .{};
errdefer set.deinit(alloc);
try set.entries.setCapacity(alloc, pin_preheat);
set.putAssumeCapacityNoClobber(viewport_pin, {});
return set;
}
const initPages_tw = tripwire.module(enum {
page_node,
page_buf_std,
@@ -1098,9 +1113,8 @@ pub fn clone(
// Create our viewport. In a clone, the viewport always goes
// to the top.
const viewport_pin = try pool.pins.create();
var tracked_pins: PinSet = .{};
var tracked_pins = try initTrackedPins(pool.alloc, viewport_pin);
errdefer tracked_pins.deinit(pool.alloc);
try tracked_pins.putNoClobber(pool.alloc, viewport_pin, {});
// Our list of pages
var page_list: List = .{};
@@ -7560,9 +7574,8 @@ pub const Builder = struct {
viewport_pin.* = active_top;
// Setup our one viewport tracked pin
var tracked_pins: PinSet = .{};
var tracked_pins = try initTrackedPins(self.pool.alloc, viewport_pin);
errdefer tracked_pins.deinit(self.pool.alloc);
try tracked_pins.putNoClobber(self.pool.alloc, viewport_pin, {});
// Initialize limits
var limits: Limits = .init(self.options.cols, self.options.rows);