causalprof

causalprof.diff

diff --git a/src/net/http/server.go b/src/net/http/server.go
index 57e1b5dacb..31c8352ca2 100644
--- a/src/net/http/server.go
+++ b/src/net/http/server.go
@@ -22,6 +22,7 @@ import (
 	"os"
 	"path"
 	"runtime"
+	"runtime/causalprof"
 	"strconv"
 	"strings"
 	"sync"
@@ -1765,6 +1766,7 @@ func (c *conn) serve(ctx context.Context) {
 	c.bufw = newBufioWriterSize(checkConnErrorWriter{c}, 4<<10)
 
 	for {
+		prog := causalprof.StartProgress()
 		w, err := c.readRequest(ctx)
 		if c.r.remain != c.server.initialReadLimitSize() {
 			// If we read any bytes off the wire, we're active.
@@ -1857,6 +1859,7 @@ func (c *conn) serve(ctx context.Context) {
 			}
 		}
 		c.rwc.SetReadDeadline(time.Time{})
+		prog.Stop()
 	}
 }