| Message ID | 20241103032111.333282-13-kanchana.p.sridhar@intel.com |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | zswap IAA compress batching | expand |
Hi Kanchana, kernel test robot noticed the following build errors: [auto build test ERROR on 5c4cf96cd70230100b5d396d45a5c9a332539d19] url: https://github.com/intel-lab-lkp/linux/commits/Kanchana-P-Sridhar/crypto-acomp-Define-two-new-interfaces-for-compress-decompress-batching/20241103-112337 base: 5c4cf96cd70230100b5d396d45a5c9a332539d19 patch link: https://lore.kernel.org/r/20241103032111.333282-13-kanchana.p.sridhar%40intel.com patch subject: [PATCH v2 12/13] mm: Add sysctl vm.compress-batching switch for compress batching during swapout. config: m68k-stmark2_defconfig (https://download.01.org/0day-ci/archive/20241103/202411031633.Hlf9Mjxh-lkp@intel.com/config) compiler: m68k-linux-gcc (GCC) 13.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241103/202411031633.Hlf9Mjxh-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202411031633.Hlf9Mjxh-lkp@intel.com/ All errors (new ones prefixed by >>): In file included from mm/swap.c:17: >> include/linux/mm.h:88:27: error: expected identifier or '(' before numeric constant 88 | #define compress_batching 0 | ^ mm/swap.c:51:14: note: in expansion of macro 'compress_batching' 51 | unsigned int compress_batching; | ^~~~~~~~~~~~~~~~~ mm/swap.c: In function 'swap_setup': >> mm/swap.c:1082:27: error: lvalue required as left operand of assignment 1082 | compress_batching = 0; | ^ vim +88 include/linux/mm.h 82 83 #ifdef CONFIG_SYSCTL 84 extern int sysctl_legacy_va_layout; 85 extern unsigned int compress_batching; 86 #else 87 #define sysctl_legacy_va_layout 0 > 88 #define compress_batching 0 89 #endif 90
Hi Kanchana,
kernel test robot noticed the following build errors:
[auto build test ERROR on 5c4cf96cd70230100b5d396d45a5c9a332539d19]
url: https://github.com/intel-lab-lkp/linux/commits/Kanchana-P-Sridhar/crypto-acomp-Define-two-new-interfaces-for-compress-decompress-batching/20241103-112337
base: 5c4cf96cd70230100b5d396d45a5c9a332539d19
patch link: https://lore.kernel.org/r/20241103032111.333282-13-kanchana.p.sridhar%40intel.com
patch subject: [PATCH v2 12/13] mm: Add sysctl vm.compress-batching switch for compress batching during swapout.
config: i386-buildonly-randconfig-002-20241103 (https://download.01.org/0day-ci/archive/20241103/202411031803.xNibgI5N-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241103/202411031803.xNibgI5N-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411031803.xNibgI5N-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from mm/swap.c:17:
In file included from include/linux/mm.h:2213:
include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
518 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
In file included from mm/swap.c:26:
include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
47 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
| ~~~~~~~~~~~ ^ ~~~
include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
49 | NR_ZONE_LRU_BASE + lru, nr_pages);
| ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/swap.c:51:14: error: expected identifier or '('
51 | unsigned int compress_batching;
| ^
include/linux/mm.h:88:27: note: expanded from macro 'compress_batching'
88 | #define compress_batching 0
| ^
>> mm/swap.c:1082:20: error: expression is not assignable
1082 | compress_batching = 0;
| ~~~~~~~~~~~~~~~~~ ^
3 warnings and 2 errors generated.
vim +51 mm/swap.c
49
50 /* Enable/disable compress batching during swapout. */
> 51 unsigned int compress_batching;
52
diff --git a/include/linux/mm.h b/include/linux/mm.h index 610653a8b0fe..c94ba5c36169 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -82,8 +82,10 @@ extern const int page_cluster_max; #ifdef CONFIG_SYSCTL extern int sysctl_legacy_va_layout; +extern unsigned int compress_batching; #else #define sysctl_legacy_va_layout 0 +#define compress_batching 0 #endif #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 79e6cb1d5c48..e298857595b4 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2064,6 +2064,15 @@ static struct ctl_table vm_table[] = { .extra1 = SYSCTL_ZERO, .extra2 = (void *)&page_cluster_max, }, + { + .procname = "compress-batching", + .data = &compress_batching, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_douintvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE, + }, { .procname = "dirtytime_expire_seconds", .data = &dirtytime_expire_interval, diff --git a/mm/swap.c b/mm/swap.c index 638a3f001676..bc4c9079769e 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -47,6 +47,9 @@ int page_cluster; const int page_cluster_max = 31; +/* Enable/disable compress batching during swapout. */ +unsigned int compress_batching; + struct cpu_fbatches { /* * The following folio batches are grouped together because they are protected @@ -1074,4 +1077,7 @@ void __init swap_setup(void) * Right now other parts of the system means that we * _really_ don't want to cluster much more */ + + /* Disable compress batching during swapout by default. */ + compress_batching = 0; }
The sysctl vm.compress-batching parameter is 0 by default. If the platform has Intel IAA, the user can run experiments with IAA compress batching of large folios in zswap_store() as follows: sysctl vm.compress-batching=1 echo deflate-iaa > /sys/module/zswap/parameters/compressor This is expected to significantly improve zswap_store() latency of swapping out large folios due to parallel compression of 8 pages in the large folio at a time, in hardware. Setting vm.compress-batching to "1" takes effect only if the zswap compression algorithm's crypto_acomp registers implementations for the batch_compress() and batch_decompress() API. In other words, compress batching works only with the iaa_crypto driver, that does register these new batching API. It is a no-op for compressors that do not register the batching API. The sysctl vm.compress-batching acts as a switch because it takes effect upon future zswap_store() calls on any given core. If the switch is "1", large folios will use parallel batched compression of the folio's pages. If the switch is "0", zswap_store() will use sequential compression for storing every page in a large folio. Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@intel.com> --- include/linux/mm.h | 2 ++ kernel/sysctl.c | 9 +++++++++ mm/swap.c | 6 ++++++ 3 files changed, 17 insertions(+)