[Mesa-dev] [PATCH 3/3] softpipe: Cap to 2 GB on 32 bits

[Axel Davy]

On 32 bits system, application memory is quite limited.
softpipe uses application memory. To help prevent memory
exhaustion, limit reported memory availability to 2GB.

Some gallium nine apps do check reported memory by allocating
resources until memory is full. Gallium nine refuses allocations
when 80% of the reported memory limit is used. This change
helps some apps to start.

Signed-off-by: Axel Davy <axel.davy at ens.fr>
---
 src/gallium/drivers/softpipe/sp_screen.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index cd4269f..b2c3c7a 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -230,6 +230,12 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
       if (!os_get_total_physical_memory(&system_memory))
          return 0;
 
+      if (sizeof(void *) == 4)
+         /* Cap to 2 GB on 32 bits system. We do this because softpipe does
+          * eat application memory, which is quite limited on 32 bits. App
+          * shouldn't expect too much available memory. */
+         system_memory = MIN2(system_memory, 2048 << 20);
+
       return (int)(system_memory >> 20);
    }
    case PIPE_CAP_UMA:
-- 
2.10.0