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Fix vmem_size()

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Add a minimal implementation of vmem_size() which accounts for the
virtual memory usage of the SPL's kmem cache.  This functionality
is only useful on 32-bit systems with a small virtual address space.

The following assumptions are made:

  1) The major SPL consumer of virtual memory is the kmem cache.
  2) Memory allocated with vmem_alloc() is short lived and can be ignored.
  3) Allow a 4MB floor as a generous pad given normal consumption.
  4) The spl_kmem_cache_sem only contends with cache create/destroy.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Ubuntu
2016-10-28 20:56:38 +00:00
committed by Brian Behlendorf
parent 7b25c48e6e
commit 1b457bcbe5
2 changed files with 44 additions and 9 deletions
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module/splat/splat-kmem.c
+14 -5
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@@ -1131,9 +1131,15 @@ out:
static int
splat_kmem_test10(struct file *file, void *arg)
{
uint64_t size, alloc, rc = 0;
uint64_t size, alloc, maxsize, limit, rc = 0;
for (size = 32; size <= 1024*1024; size *= 2) {
#if defined(CONFIG_64BIT)
maxsize = (1024 * 1024);
#else
maxsize = (128 * 1024);
#endif
for (size = 32; size <= maxsize; size *= 2) {
splat_vprint(file, SPLAT_KMEM_TEST10_NAME, "%-22s %s", "name",
"time (sec)\tslabs \tobjs \thash\n");
@@ -1142,8 +1148,10 @@ splat_kmem_test10(struct file *file, void *arg)
for (alloc = 1; alloc <= 1024; alloc *= 2) {
/* Skip tests which exceed 1/2 of physical memory. */
if (size * alloc * SPLAT_KMEM_THREADS > physmem / 2)
/* Skip tests which exceed 1/2 of memory. */
limit = MIN(physmem * PAGE_SIZE,
vmem_size(NULL, VMEM_ALLOC | VMEM_FREE)) / 2;
if (size * alloc * SPLAT_KMEM_THREADS > limit)
continue;
rc = splat_kmem_cache_thread_test(file, arg,
@@ -1223,7 +1231,8 @@ splat_kmem_test13(struct file *file, void *arg)
int i, rc = 0, max_time = 10;
size = 128 * 1024;
count = ((physmem * PAGE_SIZE) / 4 / size);
count = MIN(physmem * PAGE_SIZE, vmem_size(NULL,
VMEM_ALLOC | VMEM_FREE)) / 4 / size;
kcp = splat_kmem_cache_test_kcp_alloc(file, SPLAT_KMEM_TEST13_NAME,
size, 0, 0);