Good evening.
Robert Mustacchi писал 08.10.2013 21:56:
On 10/7/13 23:30 , Alexander Pyhalov wrote:
I'm just a bit confused: is munmap supposed to wait for something in
any
case? I thought it just have to return with error if something is
wrong...
Yes, munmap is supposed to actually unmap things before it returns.
Specifically you're probably at this line of code:
http://src.illumos.org/source/xref/illumos-gate/usr/src/uts/common/vm/vm_as.c#1480
Starting here
http://src.illumos.org/source/xref/illumos-gate/usr/src/uts/common/vm/vm_as.c#1240
is a block comment that describes some of the things that we're waiting
for. I'm not sure which of these applies.
It seems that application also uses madvise with MADV_WILLNEED on its
mapped memory. Can it influence the munmap behavior?
Hard to say for certain. The VM subsystem is notoriously tricky. But
all
this appears to do is start an asynchronous fault of the pages. Does
the
program also do something like lock memory or use aio?
I haven't found something similar, however I just don't know what should
I look for.
I've grepped for "aio" without any success. Removed madvise system calls
- no changes...
---
System Administrator of Southern Federal University Computer Center
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