From: James Simmons <jsimmons@edgeglobal.com>
To: linux-mm@kvack.org
Subject: mm->mmap_sem
Date: Wed, 22 Sep 1999 17:02:07 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.10.9909221454320.26444-100000@imperial.edgeglobal.com> (raw)
I noticed that mm_struct has a semaphore in it. How go is it protecting
the memory region? Say we have teh following case. I have a process
that mmaps a chunk of memory and this memory can be sharded with other
processes. What if the process does a mlock which does a
down(mm->mmap_sem). Now the process goes to sleep and another process
tries to modify the memory region. Will this semaphore protect this
region? In a SMP machine same thing. What kind of protect does this
semaphore provide? Does it prevent other process from doing anything to
the memory. I meant even writing or read it. Thank you.
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next reply other threads:[~1999-09-22 20:59 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-09-22 21:02 James Simmons [this message]
1999-09-24 0:07 ` mm->mmap_sem Stephen C. Tweedie
1999-09-24 14:59 ` mm->mmap_sem James Simmons
1999-09-24 18:09 ` mm->mmap_sem Stephen C. Tweedie
1999-09-25 1:24 ` mm->mmap_sem James Simmons
1999-09-25 14:55 ` mm->mmap_sem Andrea Arcangeli
1999-09-25 16:50 ` mm->mmap_sem James Simmons
1999-09-25 17:06 ` mm->mmap_sem Andrea Arcangeli
1999-09-26 1:19 ` mm->mmap_sem James Simmons
1999-09-26 14:07 ` mm->mmap_sem Andrea Arcangeli
1999-09-27 8:55 ` mm->mmap_sem Marcus Sundberg
1999-09-27 19:31 ` mm->mmap_sem James Simmons
1999-09-29 23:00 ` mm->mmap_sem Stephen C. Tweedie
1999-09-30 0:17 ` mm->mmap_sem James Simmons
1999-09-30 0:23 ` mm->mmap_sem Benjamin C.R. LaHaise
1999-09-30 14:59 ` mm->mmap_sem James Simmons
1999-09-30 15:15 ` mm->mmap_sem Benjamin C.R. LaHaise
1999-09-30 16:05 ` mm->mmap_sem James Simmons
1999-09-30 14:54 ` mm->mmap_sem Stephen C. Tweedie
1999-09-27 14:16 ` mm->mmap_sem Stephen C. Tweedie
1999-09-27 20:22 ` mm->mmap_sem James Simmons
1999-09-27 14:13 ` mm->mmap_sem Stephen C. Tweedie
1999-09-27 8:08 ` mm->mmap_sem Neil Conway
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