commit 760496bae0833e41e9f05c20a8eadbf108b4e9bc
author Oven <liyangouwen1@oppo.com> Fri Jun 16 20:51:14 2023 +0800
committer Yinchu Chen <chenyc5@motorola.com> Fri Sep 22 12:36:10 2023 +0000
tree bd7324cb461c0ffc9c57db8e2d17c35e08e51f96
parent 4cfdbaab37716170fc09132b112c1b332f5f2dd6

ANDROID: vendor_hook: Add hook to tune readaround size

In some situations, we want to decrease readaround size for better
performance. So we add this hook.

Bug: 288216516
Bug: 301581631
Change-Id: If2f5f75976c99ff1f82ce29d370f9216926055ab
Signed-off-by: Oven <liyangouwen1@oppo.com>

drivers/android/vendor_hooks.c

diff --git a/drivers/android/vendor_hooks.c b/drivers/android/vendor_hooks.c
index 2c894cb..2301012 100644
--- a/drivers/android/vendor_hooks.c
+++ b/drivers/android/vendor_hooks.c
@@ -256,6 +256,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_page_referenced_check_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_drain_all_pages_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_cma_drain_all_pages_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_pcplist_add_cma_pages_bypass);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_tune_mmap_readaround);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_shrink_slab_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_selinux_avc_insert);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_selinux_avc_node_delete);

include/trace/hooks/mm.h

diff --git a/include/trace/hooks/mm.h b/include/trace/hooks/mm.h
index 75fa193..1f2840f 100644
--- a/include/trace/hooks/mm.h
+++ b/include/trace/hooks/mm.h
@@ -86,6 +86,10 @@ DECLARE_HOOK(android_vh_cma_drain_all_pages_bypass,
 DECLARE_HOOK(android_vh_pcplist_add_cma_pages_bypass,
 	TP_PROTO(int migratetype, bool *bypass),
 	TP_ARGS(migratetype, bypass));
+DECLARE_HOOK(android_vh_tune_mmap_readaround,
+	TP_PROTO(unsigned int ra_pages, pgoff_t pgoff,
+		pgoff_t *start, unsigned int *size, unsigned int *async_size),
+	TP_ARGS(ra_pages, pgoff, start, size, async_size));
 DECLARE_HOOK(android_vh_mmap_region,
 	TP_PROTO(struct vm_area_struct *vma, unsigned long addr),
 	TP_ARGS(vma, addr));

mm/filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 31a6174..c6613f4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2983,6 +2983,8 @@ static struct file *do_sync_mmap_readahead(struct vm_fault *vmf)
 	ra->start = max_t(long, 0, vmf->pgoff - ra->ra_pages / 2);
 	ra->size = ra->ra_pages;
 	ra->async_size = ra->ra_pages / 4;
+	trace_android_vh_tune_mmap_readaround(ra->ra_pages, vmf->pgoff,
+			&ra->start, &ra->size, &ra->async_size);
 	ractl._index = ra->start;
 	do_page_cache_ra(&ractl, ra->size, ra->async_size);
 	return fpin;