安卓：PSS（比例集大小）计算 [英] Android : PSS (Proportional Set Size) Calculation

问题描述

我试图找出如何在PSS计算的是Android。

I am trying to figure out how the PSS is calculated is Android.

我发现一个文章，指出以下。

I found one article that states the following.

比例设置大小的处理的（PSS）是页面的计数   它在存储器中，其中每个页面由数除以   处理分享。因此，如果一个进程有1000页所有的本身，   1000与另外一个进程共享，其PSS将是1500

The "proportional set size" (PSS) of a process is the count of pages it has in memory, where each page is divided by the number of processes sharing it. So if a process has 1000 pages all to itself, and 1000 shared with one other process, its PSS will be 1500

我的第一个问题是，是上面的信息是否准确？如果不是，可能有人告诉我它是如何真正计算出来的？

My first question is, is the above information accurate ? If not, could someone tell me how it is really calculated ?

此外，这个值是千字节，或为PSS单位本身？

Also, is this value is kilobytes or is "PSS" a unit by itself ?

推荐答案

是的，这些信息是准确的，这就是它究竟是如何计算出来的。 （该LWN.net文章这里;请注意，马特·麦考尔谁在该线程参与您链接到开发该功能。）

Yes, that information is accurate, and that's exactly how it is calculated. (The LWN.net article is here; note that Matt Mackall who participates in that thread you link to developed that feature.)

PSS以KB为单位，像所有其他的信息，您在得到的/ proc /＆LT; PID＆GT; / smaps 。其单位如下从它是如何计算出来的。

PSS is in kilobytes, like all the other information you get in /proc/<pid>/smaps. Its unit follows from how it is calculated.

（<一href="http://unix.stackexchange.com/questions/34189/how-often-is-pss-value-updated-for-a-given-process-in-proc-pid-smaps">How往往是PSS值更新为在一个给定的过程中的/ proc / PID / smaps 有一些指针在何处以及如何PSS计算 - 免责声明：我写的答案，有上的的Unix和放大器; Linux的的讨论PSS和相关指标）

(How often is PSS value updated for a given process in /proc/pid/smaps has some pointers as to where and how PSS is calculated - disclaimer: I wrote the answer there. There are a few other posts on Unix & Linux that discuss PSS and related metrics.)

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