duff/android_kernel_motorola_sm6225
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moto_mmap_fault: Support the new hook

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The latest GKI has added a vendor hook to tune ra size in
do_sync_mmap_readahead(). Add a new handler to limit the
mmap readahead size.

Change-Id: I609fd3e4583b37561faea5e108ca9e664f956098
Reviewed-on: https://gerrit.mot.com/2676241
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Zonghua Liu <a17671@motorola.com>
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Reviewed-by: Chuanchun Zhu <zhucc2@motorola.com>
Submit-Approved: Jira Key
Reviewed-on: https://gerrit.mot.com/2676239
This commit is contained in:
Xiaojun Ji committed 2023-08-06 22:22:14 -05:00
1 parent 453244628e
commit 6dd6d921ca
2 files changed
+33 -1
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drivers/moto_mmap_fault/Android.mk
+6
View File
@@ -5,4 +5,10 @@ include $(CLEAR_VARS)
LOCAL_MODULE := moto_mmap_fault.ko
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_PATH := $(KERNEL_MODULES_OUT)
ifeq ($(TUNE_MMAP_READAROUND), true)
KERNEL_CFLAGS += KCFLAGS=-DTUNE_MMAP_READAROUND
KBUILD_OPTIONS += KCFLAGS=-DTUNE_MMAP_READAROUND
endif
include $(DLKM_DIR)/AndroidKernelModule.mk
drivers/moto_mmap_fault/moto_mmap_fault.c
+27 -1
View File
@@ -14,10 +14,28 @@
#include <linux/module.h>
#include <trace/hooks/mm.h>
#include <linux/pagemap.h>
#include <linux/version.h>
static int max_ra_pages = 8;
module_param(max_ra_pages, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(max_ra_pages, "Max read ahead pages");
#if LINUX_VERSION_CODE > KERNEL_VERSION(5, 15, 104) || (LINUX_VERSION_CODE > KERNEL_VERSION(5, 10, 177) && LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0))
#ifndef TUNE_MMAP_READAROUND
#define TUNE_MMAP_READAROUND
#endif
#endif
#if defined(TUNE_MMAP_READAROUND)
static void __nocfi tune_mmap_readaround(void *p, unsigned int ra_pages, pgoff_t pgoff,
pgoff_t *start, unsigned int *size, unsigned int *async_size)
{
*start = max_t(long, 0, pgoff - max_ra_pages / 2);
*size = max_ra_pages;
*async_size = max_ra_pages / 4;
return;
}
#else
static void __nocfi filemap_fault_get_page(void *p, struct vm_fault *vmf, struct page **page_out, bool *retry)
{
struct file *file = vmf->vma->vm_file;
@@ -82,13 +100,17 @@ static void __nocfi filemap_fault_cache_page(void *p, struct vm_fault *vmf, stru
vmf->android_oem_data1[1] = 0;
}
}
#endif
static int __nocfi __init moto_mmap_fault_init(void)
{
int ret = 0;
#if defined(TUNE_MMAP_READAROUND)
ret = register_trace_android_vh_tune_mmap_readaround(tune_mmap_readaround, NULL);
#else
ret = register_trace_android_vh_filemap_fault_get_page(filemap_fault_get_page, NULL) ?:
register_trace_android_vh_filemap_fault_cache_page(filemap_fault_cache_page, NULL);
#endif
if (ret != 0)
return -ENXIO;
else
@@ -96,8 +118,12 @@ static int __nocfi __init moto_mmap_fault_init(void)
}
static void __nocfi __exit moto_mmap_fault_exit(void)
{
#if defined(TUNE_MMAP_READAROUND)
unregister_trace_android_vh_tune_mmap_readaround(tune_mmap_readaround, NULL);
#else
unregister_trace_android_vh_filemap_fault_get_page(filemap_fault_get_page, NULL);
unregister_trace_android_vh_filemap_fault_cache_page(filemap_fault_cache_page, NULL);
#endif
}
module_init(moto_mmap_fault_init);