From: Juergen Gross <jgross@suse.com>
To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>,
samuel.thibault@ens-lyon.org, wei.liu2@citrix.com
Subject: [PATCH 4/9] mini-os: add description of x86 memory usage
Date: Tue, 19 Jul 2016 10:44:20 +0200 [thread overview]
Message-ID: <1468917865-12828-5-git-send-email-jgross@suse.com> (raw)
In-Reply-To: <1468917865-12828-1-git-send-email-jgross@suse.com>
Add a brief description how the physical and virtual address usage
looks like on x86 to include/x86/arch_mm.h
Signed-off-by: Juergen Gross <jgross@suse.com>
---
include/x86/arch_mm.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/x86/arch_mm.h b/include/x86/arch_mm.h
index 58f29fc..f756dab 100644
--- a/include/x86/arch_mm.h
+++ b/include/x86/arch_mm.h
@@ -36,6 +36,26 @@
#endif
#endif
+/*
+ * Physical address space usage:
+ *
+ * 0..._edata: kernel text/data
+ * *stack : kernel stack (thread 0)
+ * hypervisor allocated data: p2m_list, start_info page, xenstore page,
+ * console page, initial page tables
+ * bitmap of allocated pages
+ * pages controlled by the page allocator
+ *
+ *
+ * Virtual address space usage:
+ *
+ * 1:1 mapping of physical memory starting at VA(0)
+ * 1 unallocated page
+ * demand map area (32 bits: 2 GB, 64 bits: 128 GB) for virtual allocations
+ * 1 unallocated page
+ * with libc: heap area (32 bits: 1 GB, 64 bits: 128 GB)
+ */
+
#define L1_FRAME 1
#define L2_FRAME 2
#define L3_FRAME 3
--
2.6.6
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next prev parent reply other threads:[~2016-07-19 8:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-19 8:44 [PATCH 0/9] mini-os: prepare for support of ballooning Juergen Gross
2016-07-19 8:44 ` [PATCH 1/9] mini-os: correct first free pfn Juergen Gross
2016-07-19 8:44 ` [PATCH 2/9] mini-os: remove unused alloc_contig_pages() function Juergen Gross
2016-07-19 8:44 ` [PATCH 3/9] mini-os: remove MM_DEBUG code Juergen Gross
2016-07-19 8:44 ` Juergen Gross [this message]
2016-07-19 8:44 ` [PATCH 5/9] mini-os: add nr_free_pages counter Juergen Gross
2016-07-19 8:44 ` [PATCH 6/9] mini-os: let memory allocation fail if no free page available Juergen Gross
2016-07-19 8:44 ` [PATCH 7/9] mini-os: add ballooning config item Juergen Gross
2016-07-19 8:44 ` [PATCH 8/9] mini-os: get maximum memory size from hypervisor Juergen Gross
2016-07-19 8:44 ` [PATCH 9/9] mini-os: modify virtual memory layout for support of ballooning Juergen Gross
2016-07-25 13:52 ` [PATCH 0/9] mini-os: prepare " Wei Liu
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