softpipe: Cap to 2 GB on 32 bits

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@ens.fr>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 6ffc7771c8353c14495792adc54dbf7bfb7880c4..880480b581a7fb316d625fe82376a5c8a8d59fd3 100644 (file)
--- 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: