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ANDROID: add for tuning readahead size

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Tune ReadAhead size for better memory usage and performance.
accordding to Read-Ahead Efficiency on Mobile Devices: Observation,
Characterization, and Optimization form IEEE

Bug: 229839032
Change-Id: I91656bde5e616e181fd7557554d55e7ce1858136
Signed-off-by: liang zhang <liang.zhang@transsion.com>
This commit is contained in:
liang zhang
2022-04-21 09:43:37 +00:00
parent 6def3a5ed8
commit f06daa5a0b
3 changed files with 7 additions and 0 deletions
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1
drivers/android/vendor_hooks.c
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@@ -397,3 +397,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_has_work_ilocked);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_read_done); EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_read_done);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_handle_tlb_conf); EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_handle_tlb_conf);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_shrink_node_memcgs); EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_shrink_node_memcgs);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ra_tuning_max_page);

4
include/trace/hooks/mm.h
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@@ -132,6 +132,10 @@ struct device;
DECLARE_HOOK(android_vh_subpage_dma_contig_alloc, DECLARE_HOOK(android_vh_subpage_dma_contig_alloc,
TP_PROTO(bool *allow_subpage_alloc, struct device *dev, size_t *size), TP_PROTO(bool *allow_subpage_alloc, struct device *dev, size_t *size),
TP_ARGS(allow_subpage_alloc, dev, size)); TP_ARGS(allow_subpage_alloc, dev, size));
struct readahead_control;
DECLARE_HOOK(android_vh_ra_tuning_max_page,
TP_PROTO(struct readahead_control *ractl, unsigned long *max_page),
TP_ARGS(ractl, max_page));
/* macro versions of hooks are no longer required */ /* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_MM_H */ #endif /* _TRACE_HOOK_MM_H */

2
mm/readahead.c
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@@ -459,6 +459,8 @@ static void ondemand_readahead(struct readahead_control *ractl,
if (req_size > max_pages && bdi->io_pages > max_pages) if (req_size > max_pages && bdi->io_pages > max_pages)
max_pages = min(req_size, bdi->io_pages); max_pages = min(req_size, bdi->io_pages);
trace_android_vh_ra_tuning_max_page(ractl, &max_pages);
/* /*
* start of file * start of file
*/ */