From df26dc07e9cb1316d326b1d9291d390f13c800be Mon Sep 17 00:00:00 2001
From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Date: Tue, 9 Jan 2018 15:11:28 +0100
Subject: [PATCH] trace_subject_reporter: adjust ram usage

to trace connection

Issue #2638
---
 repos/os/src/app/trace_subject_reporter/main.cc | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/repos/os/src/app/trace_subject_reporter/main.cc b/repos/os/src/app/trace_subject_reporter/main.cc
index b8d095ac6a..fc860a8f0e 100644
--- a/repos/os/src/app/trace_subject_reporter/main.cc
+++ b/repos/os/src/app/trace_subject_reporter/main.cc
@@ -18,6 +18,7 @@
 #include <base/attached_rom_dataspace.h>
 #include <base/heap.h>
 #include <os/reporter.h>
+#include <util/retry.h>
 
 
 struct Trace_subject_registry
@@ -79,11 +80,19 @@ struct Trace_subject_registry
 			_entries = sorted;
 		}
 
+		unsigned update_subjects(Genode::Trace::Connection &trace)
+		{
+			return Genode::retry<Genode::Out_of_ram>(
+				[&] () { return trace.subjects(_subjects, MAX_SUBJECTS); },
+				[&] () { trace.upgrade_ram(4096); }
+			);
+		}
+
 	public:
 
 		void update(Genode::Trace::Connection &trace, Genode::Allocator &alloc)
 		{
-			unsigned const num_subjects = trace.subjects(_subjects, MAX_SUBJECTS);
+			unsigned const num_subjects = update_subjects(trace);
 
 			/* add and update existing entries */
 			for (unsigned i = 0; i < num_subjects; i++) {
@@ -150,7 +159,7 @@ struct App::Main
 {
 	Env &_env;
 
-	Trace::Connection _trace { _env, 512*1024, 32*1024, 0 };
+	Trace::Connection _trace { _env, 10*4096, 32*1024, 0 };
 
 	Reporter _reporter { _env, "trace_subjects", "trace_subjects", 64*1024 };