To: Scott Bronson <bronson@rinspin.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: Getting the page size of currently running kernel
References: <200502191901.57425.bronson@rinspin.com>
From: Roland Dreier <roland@topspin.com>
Date: Sat, 19 Feb 2005 19:28:27 -0800
In-Reply-To: <200502191901.57425.bronson@rinspin.com> (Scott Bronson's
 message of "Sat, 19 Feb 2005 19:01:57 -0800")
Message-ID: <521xbbucys.fsf@topspin.com>
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    Scott> Is there any way to get a running kernel to tell you the
    Scott> size of its pages?  Why: I'm writing a quick Perl hack to
    Scott> monitor the memory usage of the TCP stack over time.  Easy
    Scott> enough: /proc/net/sockstat gives the current value of
    Scott> tcp_memory_allocated.  But how do I convert this into
    Scott> bytes?  I don't want to hard code PAGE_SIZE into my Perl
    Scott> script, complete with a lookup table for 4K vs. 8K
    Scott> architectures!  Am I missing something obvious here?

I'm not sure exactly how to call it from perl, but from C one can use
sysconf(3) like:

	page_size = sysconf(_SC_PAGESIZE);

(one can also use getpagesize(2) to do exactly the same thing)

 - R.
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