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set threadMonitorLib [apply {{} {
set cc [C]
$cc cflags -I. -I./vendor/tracy/public
$cc include "workqueue.h"
$cc include "common.h"
$cc code {
extern ThreadControlBlock threads[];
extern int _Atomic threadCount;
extern Db* db;
extern int unsafe_workQueueCopy(WorkQueueItem* into, int maxn, WorkQueue* q);
extern void traceItem(char* buf, size_t bufsz, WorkQueueItem item);
Jim_Obj* itemToStringObj(WorkQueueItem item) {
char buf[10000]; traceItem(buf, sizeof(buf), item);
return Jim_NewStringObj(interp, buf, -1);
}
}
$cc proc workerTids {} Jim_Obj* {
// Fallback on macOS, where we don't have /proc to query all
// threads of the Folk process.
Jim_Obj* ret = Jim_NewListObj(interp, NULL, 0);
for (int i = 0; i < threadCount; i++) {
if (threads[i].tid != 0) {
Jim_ListAppendElement(interp, ret,
Jim_NewIntObj(interp, threads[i].tid));
}
}
return ret;
}
$cc proc workerInfo {int threadIndex} Jim_Obj* {
if (threadIndex >= threadCount || threads[threadIndex].tid == 0) {
return Jim_NewEmptyStringObj(interp);
}
ThreadControlBlock *thread = &threads[threadIndex];
Jim_Obj* ret = Jim_NewDictObj(interp, NULL, 0);
WorkQueueItem item = thread->currentItem;
Jim_DictAddElement(interp, ret, Jim_NewStringObj(interp, "op", -1),
itemToStringObj(item));
WorkQueueItem items[100];
int nitems = unsafe_workQueueCopy(items, 100, thread->workQueue);
Jim_Obj* workQueueObj = Jim_NewListObj(interp, NULL, 0);
for (int i = 0; i < nitems; i++) {
Jim_ListAppendElement(interp, workQueueObj,
itemToStringObj(items[i]));
}
Jim_DictAddElement(interp, ret,
Jim_NewStringObj(interp, "workQueue", -1),
workQueueObj);
Jim_DictAddElement(interp, ret,
Jim_NewStringObj(interp, "isDeactivated", -1),
Jim_NewIntObj(interp, thread->isDeactivated));
Jim_DictAddElement(interp, ret,
Jim_NewStringObj(interp, "currentItemStartTimestamp", -1),
Jim_ObjPrintf("%" PRId64, thread->currentItemStartTimestamp));
int64_t now = timestamp_get(thread->clockid);
Jim_DictAddElement(interp, ret,
Jim_NewStringObj(interp, "elapsed", -1),
Jim_NewDoubleObj(interp, (double)(now - thread->currentItemStartTimestamp) / 1000.0));
Jim_DictAddElement(interp, ret,
Jim_NewStringObj(interp, "_allocs", -1),
Jim_NewDoubleObj(interp, thread->_allocs));
Jim_DictAddElement(interp, ret,
Jim_NewStringObj(interp, "_frees", -1),
Jim_NewDoubleObj(interp, thread->_frees));
return ret;
}
$cc proc workerInfoFromTid {int tid} Jim_Obj* {
for (int i = 0; i < threadCount; i++) {
if (threads[i].tid == tid) {
return workerInfo(i);
}
}
return Jim_NewEmptyStringObj(interp);
}
$cc code {
#include "vendor/c11-queues/mpmc_queue.h"
extern struct mpmc_queue globalWorkQueue;
extern _Atomic int globalWorkQueueSize;
}
$cc proc globalWorkQueueAvailable {} size_t {
return mpmc_queue_available(&globalWorkQueue);
}
# Unsafely peeks at the queue.
$cc proc globalWorkQueueItems {} Jim_Obj* {
Jim_Obj *ret = Jim_NewListObj(interp, NULL, 0);
size_t head = globalWorkQueue.head;
for (size_t i = head; i < globalWorkQueue.tail; i++) {
struct mpmc_queue_cell *cell = &globalWorkQueue.buffer[i & globalWorkQueue.buffer_mask];
WorkQueueItem *ptr = cell->data;
WorkQueueItem item = *ptr;
Jim_ListAppendElement(interp, ret, itemToStringObj(item));
}
return ret;
}
return [$cc compile]
}}]
Wish the web server handles route "/threads" with handler {
set pid [pid]
try {
set tids [glob -tails -directory /proc/$pid/task *]
set userStacks [dict create]
set euStackOutput [exec eu-stack --pid=[pid] --verbose]
set currentTid none
foreach line [split $euStackOutput "\n"] {
if {[regexp {TID ([0-9]+):} $line -> tid]} {
set currentTid $tid
} else {
dict set userStacks $currentTid \
"[dict getdef $userStacks $currentTid {}]\n$line"
}
}
} on error e {
set tids [$threadMonitorLib workerTids]
}
set totalAllocsMinusFrees 0.0
html [subst {
<html>
<head>
<link rel="stylesheet" href="/style.css">
<title>Threads</title>
</head>
<body>
<h2>Threads</h2>
<ol start="0">
[join [lmap tid $tids {
set taskdir /proc/$pid/task/$tid
try {
set statusFd [open $taskdir/status r]
set status [read $statusFd]; close $statusFd
} on error e {
set status "<status unknown>"
}
set workerInfo [$threadMonitorLib workerInfoFromTid $tid]
try {
set userStack [dict get $userStacks $tid]
} on error e {
set userStack "<not found>"
}
try {
set stackFd [open $taskdir/stack r]
set kernelStack [read $stackFd]; close $stackFd
} on error e {
set kernelStack "<not permitted>"
}
set allocs [dict getdef $workerInfo _allocs -1]
set frees [dict getdef $workerInfo _frees -1]
subst {<li style="[expr {$workerInfo eq "" ? "color: gray" : ""}]">
$taskdir: [regexp -inline {State:[^\n]*\n} $status]
[expr {$workerInfo(isDeactivated) ? "(deactivated)" : "(active)"}]<br>
[if {$workerInfo eq ""} {subst {
(Not a Folk worker thread)<br>
}} else {
set totalAllocsMinusFrees [expr {$totalAllocsMinusFrees + ($allocs - $frees)}]
set workQueue [dict get $workerInfo workQueue]
subst {
[format "allocs - frees: %.2f MB" [expr {($allocs - $frees) / 1000000.0}]]
([format "allocs: %.2f MB" [/ $allocs 1000000.0]];
[format "frees: %.2f MB" [/ $frees 1000000.0]])<br>
[htmlEscape [dict get $workerInfo op]] (elapsed: [dict get $workerInfo elapsed] us)<br>
<details>
<summary>Work queue ([llength $workQueue] items):</summary>
<pre>[htmlEscape [join $workQueue "\n"]]</pre>
</details>
}
}]
<details><summary>User stack:</summary><pre>[htmlEscape $userStack]</pre></details>
<details><summary>Kernel stack:</summary><pre>[htmlEscape $kernelStack]</pre></details>
</li>}
}] "\n"]
</ol>
<p>Total allocs - frees: [format "%.2f MB" [expr {$totalAllocsMinusFrees / 1000000.0}]]</p>
<h2>Global workqueue ([$threadMonitorLib globalWorkQueueAvailable])</h2>
<ol start="0">
[lmap item [$threadMonitorLib globalWorkQueueItems] {
subst { <li>$item</li> }
}]
</ol>
</body>
</html>
}]
}
|
