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Commit 65b05158 authored by Liam Mark's avatar Liam Mark Committed by Isaac J. Manjarres
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mm, page_owner: record time and pid 



Collect the time for each allocation recorded in page owner so that
allocation "surges" can be measured.

Record the pid for each allocation recorded in page owner so that
the source of allocation "surges" can be better identified.

Change-Id: I51cad8f088b7eee9f900555680e21b7d1813d111
oldChange-Id: Ifaa7d1e26a858a562b0dfdb177e5a874478684ca
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
[isaacm@codeaurora.org: resolved merge conflicts]
Signed-off-by: default avatarIsaac J. Manjarres <isaacm@codeaurora.org>
parent 915d2b2e

mm/page_owner.c

+12 −3
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
#include <linux/migrate.h>

#include <linux/stackdepot.h>

#include <linux/seq_file.h>

#include <linux/sched.h>

#include <linux/sched/clock.h>



#include "internal.h"
@@ -25,6 +27,8 @@ struct page_owner { 
	gfp_t gfp_mask;

	depot_stack_handle_t handle;

	depot_stack_handle_t free_handle;

	int pid;

	u64 ts_nsec;

};



static bool page_owner_enabled = IS_ENABLED(CONFIG_PAGE_OWNER_ENABLE_DEFAULT);
@@ -175,6 +179,8 @@ static inline void __set_page_owner_handle(struct page *page, 
		page_owner->order = order;

		page_owner->gfp_mask = gfp_mask;

		page_owner->last_migrate_reason = -1;

		page_owner->pid = current->pid;

		page_owner->ts_nsec = local_clock();

		__set_bit(PAGE_EXT_OWNER, &page_ext->flags);

		__set_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags);
@@ -239,6 +245,8 @@ void __copy_page_owner(struct page *oldpage, struct page *newpage) 
	new_page_owner->last_migrate_reason =

		old_page_owner->last_migrate_reason;

	new_page_owner->handle = old_page_owner->handle;

	new_page_owner->pid = old_page_owner->pid;

	new_page_owner->ts_nsec = old_page_owner->ts_nsec;



	/*

	 * We don't clear the bit on the oldpage as it's going to be freed
@@ -353,9 +361,10 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn, 
		return -ENOMEM;



	ret = snprintf(kbuf, count,

			"Page allocated via order %u, mask %#x(%pGg)\n",

			"Page allocated via order %u, mask %#x(%pGg), pid %d, ts %llu ns\n",

			page_owner->order, page_owner->gfp_mask,

			&page_owner->gfp_mask);

			&page_owner->gfp_mask, page_owner->pid,

			page_owner->ts_nsec);



	if (ret >= count)

		goto err;
@@ -431,7 +440,7 @@ void __dump_page_owner(struct page *page) 
	else

		pr_alert("page_owner tracks the page as freed\n");



	pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n",

	pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg), pid %d, ts %llu ns\n",

		 page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);



	handle = READ_ONCE(page_owner->handle);