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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
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@[
filemap_map_pages+181
__handle_mm_fault+2905
handle_mm_fault+250
__do_page_fault+599
async_page_fault+69
]: 12
[...]
@[
cpuidle_enter_state+164
do_idle+390
cpu_startup_entry+111
start_secondary+423
secondary_startup_64+165
]: 22122
以99赫兹的频率分析内核调用栈并...
Multiple variables in a 'with' statement?
...upports multiple context managers:
with A() as a, B() as b, C() as c:
doSomething(a,b,c)
Unlike the contextlib.nested, this guarantees that a and b will have their __exit__()'s called even if C() or it's __enter__() method raises an exception.
You can also use earlier variables in later defi...
Using an HTML button to call a JavaScript function
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There are a few ways to handle events with HTML/DOM. There's no real right or wrong way but different ways are useful in different situations.
1: There's defining it in the HTML:
<input id="clickMe" type="button" value="clickme" onclick="doFunction();" />
2: T...
How to attach my repo to heroku app
...create a heroku app and then my machine crashed. I have a new machine. How do I attach my existing app to heroku app. When I visit heroku page the url for my app is like this
...
RSpec controller testing - blank response.body
...p normally would, use the render_views directive:
describe YourController do
render_views
...
end
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How to format a UTC date as a `YYYY-MM-DD hh:mm:ss` string using NodeJS?
...'). // replace T with a space
replace(/\..+/, '') // delete the dot and everything after
> '2012-11-04 14:55:45'
Or, in one line: new Date().toISOString().replace(/T/, ' ').replace(/\..+/, '')
ISO8601 is necessarily UTC (also indicated by the trailing Z on the first result), so you ...
How does this print “hello world”?
...
codification with 96 (96₁₀ = 1100000₂) and that should be enough to do the mapping, but that wouldn't work for space (darn space!)
Now we know that special care has to be taken to process space at the same time as the other characters. To achieve this, the code turns the 7th bit on (but not ...
React.js: Wrapping one component into another
Many template languages have "slots" or "yield" statements, that allow to do some sort of inversion of control to wrap one template inside of another.
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Counting occurrences in Vim without marking the buffer changed
In order to know how many times a pattern exists in current buffer, I do:
6 Answers
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Purpose of Python's __repr__
..., most likely one of the ways possible to create this object. See official documentation here. __repr__ is more for developers while __str__ is for end users.
A simple example:
>>> class Point:
... def __init__(self, x, y):
... self.x, self.y = x, y
... def __repr__(self):
... ...