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SystemMonitor: Unbreak the memory stats graph

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It was never updating because we'd just seek the start of /proc/memstat
over and over, which didn't generate new contents. Instead, open the
file on every iteration.
This commit is contained in:
Andreas Kling 2020-01-15 22:45:02 +01:00
parent 806f19d647
commit d9385d7d62
2 changed files with 5 additions and 14 deletions
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15
Applications/SystemMonitor/MemoryStatsWidget.cpp
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@ -1,6 +1,7 @@
#include "MemoryStatsWidget.h"
#include "GraphWidget.h"
#include <AK/JsonObject.h>
#include <LibCore/CFile.h>
#include <LibDraw/StylePainter.h>
#include <LibGUI/GBoxLayout.h>
#include <LibGUI/GLabel.h>
@ -18,13 +19,10 @@ MemoryStatsWidget* MemoryStatsWidget::the()
MemoryStatsWidget::MemoryStatsWidget(GraphWidget& graph, GWidget* parent)
: GWidget(parent)
, m_graph(graph)
, m_proc_memstat(CFile::construct("/proc/memstat"))
{
ASSERT(!s_the);
s_the = this;
if (!m_proc_memstat->open(CIODevice::OpenMode::ReadOnly))
ASSERT_NOT_REACHED();
set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
set_preferred_size(0, 72);
@ -69,9 +67,11 @@ static inline size_t bytes_to_kb(size_t bytes)
void MemoryStatsWidget::refresh()
{
m_proc_memstat->seek(0);
auto proc_memstat = CFile::construct("/proc/memstat");
if (!proc_memstat->open(CIODevice::OpenMode::ReadOnly))
ASSERT_NOT_REACHED();
auto file_contents = m_proc_memstat->read_all();
auto file_contents = proc_memstat->read_all();
auto json = JsonValue::from_string(file_contents).as_object();
unsigned kmalloc_eternal_allocated = json.get("kmalloc_eternal_allocated").to_u32();
@ -97,8 +97,3 @@ void MemoryStatsWidget::refresh()
m_graph.set_max(page_count_to_kb(user_pages_available));
m_graph.add_value(page_count_to_kb(user_physical_allocated));
}
void MemoryStatsWidget::timer_event(CTimerEvent&)
{
refresh();
}