From cbd821e664b7c800fcc99812ea5f97dc3af2184d Mon Sep 17 00:00:00 2001
From: johann <johann>
Date: Thu, 24 Sep 2009 15:11:32 +0000
Subject: [PATCH] Branch HEAD b=18505 i=adilger i=panda

limit to low memory on 32-bit system.
---
 libcfs/include/libcfs/darwin/darwin-mem.h   | 1 +
 libcfs/include/libcfs/linux/linux-mem.h     | 7 +++++++
 libcfs/include/libcfs/winnt/portals_utils.h | 1 +
 lustre/include/liblustre.h                  | 3 ++-
 lustre/ldlm/ldlm_pool.c                     | 2 +-
 lustre/ost/ost_handler.c                    | 2 +-
 6 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/libcfs/include/libcfs/darwin/darwin-mem.h b/libcfs/include/libcfs/darwin/darwin-mem.h
index 95bfa06..c7dd0a0 100644
--- a/libcfs/include/libcfs/darwin/darwin-mem.h
+++ b/libcfs/include/libcfs/darwin/darwin-mem.h
@@ -229,6 +229,7 @@ void cfs_mem_cache_free ( cfs_mem_cache_t *, void *);
  */
 /* XXX Liang: num_physpages... fix me */
 #define num_physpages			(64 * 1024)
+#define CFS_NUM_CACHEPAGES		num_physpages
 
 #define CFS_DECL_MMSPACE		
 #define CFS_MMSPACE_OPEN		do {} while(0)
diff --git a/libcfs/include/libcfs/linux/linux-mem.h b/libcfs/include/libcfs/linux/linux-mem.h
index 8fb2184..8f5a925 100644
--- a/libcfs/include/libcfs/linux/linux-mem.h
+++ b/libcfs/include/libcfs/linux/linux-mem.h
@@ -114,6 +114,13 @@ extern void __cfs_free_pages(cfs_page_t *page, unsigned int order);
 #define libcfs_memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0)
 #define libcfs_memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
 
+#if BITS_PER_LONG == 32
+/* limit to lowmem on 32-bit systems */
+#define CFS_NUM_CACHEPAGES min(num_physpages, 1UL << (30-CFS_PAGE_SHIFT) *3/4)
+#else
+#define CFS_NUM_CACHEPAGES num_physpages
+#endif
+
 /*
  * In Linux there is no way to determine whether current execution context is
  * blockable.
diff --git a/libcfs/include/libcfs/winnt/portals_utils.h b/libcfs/include/libcfs/winnt/portals_utils.h
index 54bb4ee..cb60fe2 100644
--- a/libcfs/include/libcfs/winnt/portals_utils.h
+++ b/libcfs/include/libcfs/winnt/portals_utils.h
@@ -297,6 +297,7 @@ clear_user(void __user *to, unsigned long n)
 )
 
 #define num_physpages			(64 * 1024)
+#define CFS_NUM_CACHEPAGES		num_physpages
 
 #else
 
diff --git a/lustre/include/liblustre.h b/lustre/include/liblustre.h
index 8a3332d..cb184a3 100644
--- a/lustre/include/liblustre.h
+++ b/lustre/include/liblustre.h
@@ -161,7 +161,8 @@ void get_random_bytes(void *ptr, int size);
 /* memory */
 
 /* memory size: used for some client tunables */
-#define num_physpages (256 * 1024) /* 1GB */
+#define num_physpages      (256 * 1024) /* 1GB */
+#define CFS_NUM_CACHEPAGES num_physpages
 
 
 /* VFS stuff */
diff --git a/lustre/ldlm/ldlm_pool.c b/lustre/ldlm/ldlm_pool.c
index 3542a55..9560f34 100644
--- a/lustre/ldlm/ldlm_pool.c
+++ b/lustre/ldlm/ldlm_pool.c
@@ -114,7 +114,7 @@
 /*
  * 50 ldlm locks for 1MB of RAM.
  */
-#define LDLM_POOL_HOST_L ((num_physpages >> (20 - CFS_PAGE_SHIFT)) * 50)
+#define LDLM_POOL_HOST_L ((CFS_NUM_CACHEPAGES >> (20 - CFS_PAGE_SHIFT)) * 50)
 
 /*
  * Maximal possible grant step plan in %.
diff --git a/lustre/ost/ost_handler.c b/lustre/ost/ost_handler.c
index 3f0da6c..a2fd9b9 100644
--- a/lustre/ost/ost_handler.c
+++ b/lustre/ost/ost_handler.c
@@ -2230,7 +2230,7 @@ static int ost_setup(struct obd_device *obd, struct lustre_cfg* lcfg)
                 oss_max_threads = oss_min_threads = oss_num_threads;
         } else {
                 /* Base min threads on memory and cpus */
-                oss_min_threads = num_possible_cpus() * num_physpages >>
+                oss_min_threads = num_possible_cpus() * CFS_NUM_CACHEPAGES >>
                         (27 - CFS_PAGE_SHIFT);
                 if (oss_min_threads < OSS_THREADS_MIN)
                         oss_min_threads = OSS_THREADS_MIN;
-- 
1.8.3.1