Lei Liu 36c55ce870 binder_alloc: Replace kcalloc with kvcalloc to mitigate OOM issues ... In binder_alloc, there is a frequent need for order3 memory allocation, especially on small-memory mobile devices, which can lead to OOM and cause foreground applications to be killed, resulting in flashbacks. We use kvcalloc to allocate memory, which can reduce system OOM occurrences, as well as decrease the time and probability of failure for order3 memory allocations. Additionally, It has little impact on the throughput of the binder. (as verified by Google's binder_benchmark testing tool). We have conducted multiple tests on an 8GB memory phone, kvcalloc has little performance degradation and resolves frequent OOM issues, Below is a partial excerpt of the test data. throughput(TH_PUT) = (size * Iterations)/Time kcalloc->kvcalloc: Sample with kcalloc(): adb shell stop/ kcalloc /8+256G --------------------------------------------------------------------- Benchmark Time CPU Iterations TH-PUT TH-PUTCPU (ns) (ns) (GB/s) (GB/s) --------------------------------------------------------------------- BM_sendVec_binder4 39126 18550 38894 3.976282 8.38684 BM_sendVec_binder8 38924 18542 37786 7.766108 16.3028 BM_sendVec_binder16 38328 18228 36700 15.32039 32.2141 BM_sendVec_binder32 38154 18215 38240 32.07213 67.1798 BM_sendVec_binder64 39093 18809 36142 59.16885 122.977 BM_sendVec_binder128 40169 19188 36461 116.1843 243.2253 BM_sendVec_binder256 40695 19559 35951 226.1569 470.5484 BM_sendVec_binder512 41446 20211 34259 423.2159 867.8743 BM_sendVec_binder1024 44040 22939 28904 672.0639 1290.278 BM_sendVec_binder2048 47817 25821 26595 1139.063 2109.393 BM_sendVec_binder4096 54749 30905 22742 1701.423 3014.115 BM_sendVec_binder8192 68316 42017 16684 2000.634 3252.858 BM_sendVec_binder16384 95435 64081 10961 1881.752 2802.469 BM_sendVec_binder32768 148232 107504 6510 1439.093 1984.295 BM_sendVec_binder65536 326499 229874 3178 637.8991 906.0329 NORAML TEST SUM 10355.79 17188.15 stressapptest eat 2G SUM 10088.39 16625.97 Sample with kvcalloc(): adb shell stop/ kvcalloc /8+256G ---------------------------------------------------------------------- Benchmark Time CPU Iterations TH-PUT TH-PUTCPU (ns) (ns) (GB/s) (GB/s) ---------------------------------------------------------------------- BM_sendVec_binder4 39673 18832 36598 3.689965 7.773577 BM_sendVec_binder8 39869 18969 37188 7.462038 15.68369 BM_sendVec_binder16 39774 18896 36627 14.73405 31.01355 BM_sendVec_binder32 40225 19125 36995 29.43045 61.90013 BM_sendVec_binder64 40549 19529 35148 55.47544 115.1862 BM_sendVec_binder128 41580 19892 35384 108.9262 227.6871 BM_sendVec_binder256 41584 20059 34060 209.6806 434.6857 BM_sendVec_binder512 42829 20899 32493 388.4381 796.0389 BM_sendVec_binder1024 45037 23360 29251 665.0759 1282.236 BM_sendVec_binder2048 47853 25761 27091 1159.433 2153.735 BM_sendVec_binder4096 55574 31745 22405 1651.328 2890.877 BM_sendVec_binder8192 70706 43693 16400 1900.105 3074.836 BM_sendVec_binder16384 96161 64362 10793 1838.921 2747.468 BM_sendVec_binder32768 147875 107292 6296 1395.147 1922.858 BM_sendVec_binder65536 330324 232296 3053 605.7126 861.3209 NORAML TEST SUM 10033.56 16623.35 stressapptest eat 2G SUM 9958.43 16497.55 Signed-off-by: Lei Liu <liulei.rjpt@vivo.com> Acked-by: Carlos Llamas <cmllamas@google.com> Link: https://lore.kernel.org/r/20240619113841.3362-1-liulei.rjpt@vivo.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-07-03 16:22:36 +02:00
..
binder_alloc_selftest.c	android: binder: fix a kernel-doc enum warning	2023-12-06 08:48:26 +09:00
binder_alloc.c	binder_alloc: Replace kcalloc with kvcalloc to mitigate OOM issues	2024-07-03 16:22:36 +02:00
binder_alloc.h	binder: switch alloc->mutex to spinlock_t	2023-12-05 09:23:41 +09:00
binder_internal.h	binder: use bitmap for faster descriptor lookup	2024-07-03 16:21:59 +02:00
binder_trace.h	binder: keep vma addresses type as unsigned long	2023-12-05 09:23:38 +09:00
binder.c	binder: use bitmap for faster descriptor lookup	2024-07-03 16:21:59 +02:00
binderfs.c	android: removed duplicate linux/errno	2024-01-07 09:48:26 +01:00
dbitmap.h	binder: use bitmap for faster descriptor lookup	2024-07-03 16:21:59 +02:00
Kconfig	remove CONFIG_ANDROID	2022-07-01 10:41:09 +02:00
Makefile