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memlock: use value of 0 to disable memory locking

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In cases user is sure he is not using his 'rootfs' or 'swap' on LVs
managed with his command - it possible to completely bypass pinning
process to RAM which may eventually slightly speedup command execution,
(however at the risk the process can be eventually delayed by swapping).
Basicaly use this only at your risk...

TODO: add some dmeventd support for this.
This commit is contained in:
Zdenek Kabelac 2024-09-24 16:04:53 +02:00
parent 7e2bb2a35e
commit 964012fdb9
2 changed files with 19 additions and 2 deletions
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7
lib/config/config_settings.h
View File

@ -1424,11 +1424,14 @@ cfg(activation_use_linear_target_CFG, "use_linear_target", activation_CFG_SECTIO
cfg(activation_reserved_stack_CFG, "reserved_stack", activation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_INT, DEFAULT_RESERVED_STACK, vsn(1, 0, 0), NULL, 0, NULL,
"Stack size in KiB to reserve for use while devices are suspended.\n"
"Insufficient reserve risks I/O deadlock during device suspension.\n")
"Insufficient reserve risks I/O deadlock during device suspension.\n"
"Value 0 disables memory locking.\n")
cfg(activation_reserved_memory_CFG, "reserved_memory", activation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_INT, DEFAULT_RESERVED_MEMORY, vsn(1, 0, 0), NULL, 0, NULL,
"Memory size in KiB to reserve for use while devices are suspended.\n"
"Insufficient reserve risks I/O deadlock during device suspension.\n")
"Insufficient reserve risks I/O deadlock during device suspension.\n"
"Value 0 disables memory locking.\n")
cfg(activation_process_priority_CFG, "process_priority", activation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_INT, DEFAULT_PROCESS_PRIORITY, vsn(1, 0, 0), NULL, 0, NULL,
"Nice value used while devices are suspended.\n"

14
lib/mm/memlock.c
View File

@ -517,6 +517,13 @@ static void _restore_priority_if_possible(struct cmd_context *cmd)
/* Stop memory getting swapped out */
static void _lock_mem(struct cmd_context *cmd)
{
if (!_size_stack || _size_malloc_tmp) {
log_debug_mem("Skipping memory locking (reserved memory: "
FMTsize_t " stack: " FMTsize_t ").",
_size_malloc_tmp, _size_stack);
return;
}
if (!cmd->running_on_valgrind)
_allocate_memory();
(void)strerror(0); /* Force libc.mo load */
@ -557,6 +564,13 @@ static void _unlock_mem(struct cmd_context *cmd)
{
size_t unlock_mstats = 0;
if (!_size_stack || _size_malloc_tmp) {
log_debug_mem("Skipping memory unlocking (reserved memory: "
FMTsize_t " stack: " FMTsize_t ").",
_size_malloc_tmp, _size_stack);
return;
}
log_very_verbose("Unlocking memory");
if (!_memlock_maps(cmd, LVM_MUNLOCK, &unlock_mstats))