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Try to avoid OOM killer on low-memory systems without swap.

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Benchmark for memory-hard KDF is tricky, seems that relying
on maximum half of physical memory is not enough.

Let's allow only free physical available space if there is no swap.
This should not cause changes on normal systems, at least.
This commit is contained in:
Milan Broz
2023-02-20 16:45:36 +01:00
parent 62aa392205
commit 899bad8c06
4 changed files with 67 additions and 5 deletions
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11
lib/utils_pbkdf.c
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@@ -63,7 +63,7 @@ const struct crypt_pbkdf_type *crypt_get_pbkdf_type_params(const char *pbkdf_typ
static uint32_t adjusted_phys_memory(void)
{
uint64_t memory_kb = crypt_getphysmemory_kb();
uint64_t free_kb, memory_kb = crypt_getphysmemory_kb();
/* Ignore bogus value */
if (memory_kb < (128 * 1024) || memory_kb > UINT32_MAX)
@@ -75,6 +75,15 @@ static uint32_t adjusted_phys_memory(void)
*/
memory_kb /= 2;
/*
* Never use more that available free space on system without swap.
*/
if (!crypt_swapavailable()) {
free_kb = crypt_getphysmemoryfree_kb();
if (free_kb > (64 * 1024) && free_kb < memory_kb)
return free_kb;
}
return memory_kb;
}