Re: low-level file system mechanism used by virtual memory (vminfo dtrace probe help!)
Re: low-level file system mechanism used by virtual memory (vminfo dtrace probe help!)
- Subject: Re: low-level file system mechanism used by virtual memory (vminfo dtrace probe help!)
- From: Joel Reymont <email@hidden>
- Date: Tue, 27 Oct 2009 13:25:07 +0000
On Oct 27, 2009, at 1:07 PM, Joel Reymont wrote:
How do you use it? Is the description of each probe available
somewhere?
How do I figure out which argument has what value using this
information from 'dtrace -lvP vminfo', for example?
19018 vminfo mach_kernel vnode_pagein
pgpgin
To refine the question...
pager_return_t vnode_pagein() in xnu-1456.1.26/bsd/vm/vnode_pager.c
has this bit
pages_in_upl = size / PAGE_SIZE;
DTRACE_VM2(pgpgin, int, pages_in_upl, (uint64_t *), NULL);
which appears to track the number of pages that have been paged in.
Which probe can tell me the address of the pages that are being paged
in, though?
Thanks, Joel
---
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http://wagerlabs.com
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