realign system ram functions

make the system ram function align across all supported platforms.
Taken from https://github.com/FirestormViewer/phoenix-firestorm/commit/3b074ba4af5e303125db606dd69eb4282a91f957
+ clean up FS specific comment markers and upstream code retention

1 files changed, 25 insertions, 17 deletions

diff --git a/indra/llcommon/llmemory.cpp b/indra/llcommon/llmemory.cpp
index 4b7d60d654..b9f9fdae17 100644
--- a/indra/llcommon/llmemory.cpp
+++ b/indra/llcommon/llmemory.cpp
@@ -39,6 +39,7 @@
 #elif LL_LINUX
 # include <unistd.h>
 # include <sys/resource.h>
+# include <sys/sysinfo.h>
 #endif
 
 #include "llmemory.h"
@@ -85,6 +86,7 @@ void LLMemory::initMaxHeapSizeGB(F32Gigabytes max_heap_size)
 void LLMemory::updateMemoryInfo()
 {
     LL_PROFILE_ZONE_SCOPED
+    U32Kilobytes avail_phys; 
 #if LL_WINDOWS
     PROCESS_MEMORY_COUNTERS counters;
 
@@ -95,22 +97,10 @@ void LLMemory::updateMemoryInfo()
     }
 
     sAllocatedMemInKB = U32Kilobytes::convert(U64Bytes(counters.WorkingSetSize));
-    sample(sAllocatedMem, sAllocatedMemInKB);
     sAllocatedPageSizeInKB = U32Kilobytes::convert(U64Bytes(counters.PagefileUsage));
     sample(sVirtualMem, sAllocatedPageSizeInKB);
-
-    U32Kilobytes avail_phys, avail_virtual;
+    U32Kilobytes avail_virtual; 
     LLMemoryInfo::getAvailableMemoryKB(avail_phys, avail_virtual) ;
-    sMaxPhysicalMemInKB = llmin(avail_phys + sAllocatedMemInKB, sMaxHeapSizeInKB);
-
-    if(sMaxPhysicalMemInKB > sAllocatedMemInKB)
-    {
-        sAvailPhysicalMemInKB = sMaxPhysicalMemInKB - sAllocatedMemInKB ;
-    }
-    else
-    {
-        sAvailPhysicalMemInKB = U32Kilobytes(0);
-    }
 
 #elif defined(LL_DARWIN)
     task_vm_info info;
@@ -147,21 +137,39 @@ void LLMemory::updateMemoryInfo()
     if (result == KERN_SUCCESS) {
         // This is what Chrome reports as 'the "Physical Memory Free" value reported by the Memory Monitor in Instruments.'
         // Note though that inactive pages are not included here and not yet free, but could become so under memory pressure.
-        sAvailPhysicalMemInKB = U32Bytes(vmstat.free_count * page_size);
-        sMaxPhysicalMemInKB = LLMemoryInfo::getHardwareMemSize();
-      }
+        avail_phys = U32Bytes(vmstat.free_count * page_size);
+        sMaxHeapSizeInKB = LLMemoryInfo::getHardwareMemSize();
+    }
     else
     {
         LL_WARNS() << "task_info failed" << LL_ENDL;
     }
-
+#elif defined(LL_LINUX)
+    // Use sysinfo() to get the total physical memory.
+    struct sysinfo info;
+    sysinfo(&info);
+    sMaxHeapSizeInKB = U32Kilobytes::convert((U64Bytes)info.totalram); // Total RAM in system
+    avail_phys = U32Kilobytes::convert((U64Bytes)info.freeram); // Total Free RAM in system
+    sAllocatedMemInKB = U32Kilobytes::convert(U64Bytes(LLMemory::getCurrentRSS())); // represents the RAM allocated by this process only (in line with the windows implementation)
 #else
     //not valid for other systems for now.
+    LL_WARNS() << "LLMemory::updateMemoryInfo() not implemented for this platform." << LL_ENDL;
     sAllocatedMemInKB = U64Bytes(LLMemory::getCurrentRSS());
     sMaxPhysicalMemInKB = U64Bytes(U32_MAX);
     sAvailPhysicalMemInKB = U64Bytes(U32_MAX);
 #endif
+    sample(sAllocatedMem, sAllocatedMemInKB);
+    // sMaxPhysicalMem - max this process can use = the lesser of (what we already have + what's available) or MaxHeap
+    sMaxPhysicalMemInKB = llmin(avail_phys + sAllocatedMemInKB, sMaxHeapSizeInKB); 
 
+    if(sMaxPhysicalMemInKB > sAllocatedMemInKB)
+    {
+        sAvailPhysicalMemInKB = sMaxPhysicalMemInKB - sAllocatedMemInKB ;
+    }
+    else
+    {
+        sAvailPhysicalMemInKB = U32Kilobytes(0);
+    }
     return ;
 }